'You don't trust me?': Blac Chyna breaks down in tears after ugly fight with Rob Kardashian over mystery texts in teaser for Rob & Chyna 

• e-mail

It has not been all smooth sailing for Rob Kardashian and Blac Chyna as they navigate love's course.

Their issues were put on display again in a second teaser for Rob & Chyna, which was shared by E! News on Thursday.

The 28-year-old former stripper was seen breaking down in tears in front of a friend after an ugly fight she had with the 29-year-old Keeping Up With The Kardashians star.

In pain: Blac Chyna breaks down in tears when she talks to a friend in a new teaser for her reality series with Rob Kardashian titled Rob & Chyna

A tough start: The 28-year-old beauty is upset that she has been fighting with the Keeping Up With The Kardashians star

She gets some advice: Her pal says that she has put up a 'wall' after getting her heart broken by rapper Tyga, who is now with teen Kylie Jenner

Their blow out had to do with trust.

Rob is also seen going through the model's cell phone while they sit on their king-sized bed bed.

'Yo, who is hittin' your phone over and over?' Rob asks Chyna as he keeps an eye on her cell screen. He looks angry.

He's suspicious of her: 'Yo, who is hittin' your phone over and over?' Rob asks Chyna as he keeps an eye on her cell screen. He looks angry

Level headed: The pinup - whose real name is Angela White - is calm in her response. 'Why do you wanna keep going through my phone like you don't trust me?' she offered

Tiffs: The pregnant star does not like having her cell phone searched. He says, 'I just don't get why you even care!'

The pinup - whose real name is Angela White - is calm in her response. 

'Why do you wanna keep going through my phone like you don't trust me?' she offered.

He looks annoyed and says, 'I just don't get why you even care!'

The argument: In the first teaser of the reality spinoff - which will debut on September 11 - a very pregnant Chyna is seen yelling at her fiancé Rob about 'b******' he was still texting

Angry as heck: This time we see more. Chyna is in the backseat of her car yelling into her cell phone: 'What are you still texting other females about?'

Uh-oh: Her pal looks shocked when Chyna yells into the phone

In the first teaser of the reality spinoff - which will debut on September 11 - a very pregnant Chyna is seen yelling at her fiancé Rob about 'b******' he was still texting.

This time we see more. Chyna is in the backseat of her car yelling into her cell phone: 'What are you still texting other females about? Why the f*** are you still texting bitches?'

He tries to make her happy by bring her a small bouquet to her home. 

She does not accept his flowers: He tries to make her happy by bring her a small bouquet

Not having it: 'What are these flowers for?' she snaps. 'I just wanted to apologize,' says Rob with a smile

There goes the gift: She says, 'Why you thinkin' this is a game?' then grabs the bouquet, walks out to the swimming pool and throws them over the fence into the water

Weep weep: At this point it looks as if Rob starts crying but he tries to hide his face

'What are these flowers for?' she snaps. 'I just wanted to apologize,' says Rob with a smile.

She says, 'Why you thinkin' this is a game?' then grabs the bouquet, walks out to the swimming pool and throws them over the fence into the water.

Later Rob is seen telling Scott Disick: 'We're just two different people. I don't expect her to be like me.'

He can't handle the relationship: Later Rob is seen telling Scott Disick: 'We're just two different people. I don't expect her to be like me'

Dr Disick: Scott, who seems to be the most stable person on the show, then gives him some sage input: 'I don't even know that you know exactly who you are'

Scott, who seems to be the most stable person on the show - which should say something - then gives him some sage input: 'I don't even know that you know exactly who you are.'

Rob responded with a despondent 'Yeahh.'

Later in a car Rob tells Scott - who used to be with Rob's sister Kourtney, 37: 'The whole arguing is too much. She's too hot and I'm too hot.'

The wise one: Next we see Kim, 35, in a low cut top with her makeup and hair perfectly done

She worries what kind of dad he will be: Kim says, 'Depression is a serious issue. What's going to happen when this baby is born?'

Chyna is also seen breaking down in tears as she sits on a sofa with an older woman who appears to be a therapist. 

The lady says, 'I know you have been through a lot but you put up that wall to protect yourself.'

Chyna breaks down in tears and the therapist wipes her face.

It's real: The clip ends with Rob and Chyna in a car. Chyna has her grey hoodie up as she looks over at her future husband and says, 'You really wanna spend the rest of your life with me?'

The future Mrs Kardashian is not seen saying anything.  

It looks as if Chyna fiannly realizes Rob really does have some serious issues because she looks worried as she sits down with him to say:'What can I do to help? What really triggers you to go into a dark hole?'

Next we see Kim, 35, in a low-cut top with her makeup and hair perfectly done.

He always has a joke: Scott adds some fun by telling Rob: 'I feel like this is the first time we've hit the streets together in a long time.' Later Scott says: 'It's almost like he was in jail'

Kim says, 'Depression is a serious issue. What's going to happen when this baby is born?'

The clip ends with Rob and Chyna in a car. Chyna has her grey hoodie up as she looks over at her future husband and says, 'You really wanna spend the rest of your life with me?'

We don't see him saying yes and it appears as if he is going to break down in tears.

Her bottom: There are some lighter moments in the clip too like where Chyna twerks in a pool

The clip also has some playful moments, however.

Scott adds some fun by telling Rob: 'I feel like this is the first time we've hit the streets together in a long time.' Later Scott says: 'It's almost like he was in jail.'

Disick is referring to the long period of time when Rob was a recluse.

They get along: Kim is also seen at a lunch with Kourtney, Penelope and Rob

Back in the fold: Rob is seen clinking glasses with mom Kris Jenner

Rob is then heard saying: 'It's a big change to go from being inside for like four years to being outside.'

There are several montage scenes as well with Rob rubbing Chyna's pregnant belly, her son King Cairo flashing a peace sign, and Chyna throwing up dollar bills in a strip club, getting her tongue pierced, and twerking in a swimming pool as her female friends caress her behind.

Rob is also seen having lunch with Kim and his other sisters, including Kylie Jenner who is dating Chyna's ex Tyga.

Rob & Chyna debuts on September 11 on E! 

Off to the strip club! Rob & Chyna debuts on September 11 on E!