<human>: Condense the text into a few key points

I'm typing on mobile so please excuse any errors 

I am really lost at what to do here, I have been in a relationship with my boyfriend for the last year and a half and currently pregnant with his child. 

He has a very interesting living arrangement he lives with his ex girlfriend and her sister in a small one bedroom apartment his ex's sister sleeps in the living room and him and his ex share a bed..

He promises me that nothing is happening and nothing is going on but when I sometimes FaceTime him she is topless and sleeping next to him. I told him this makes me severely uncomfortable and currently sleeps in a tiny rocker next to the bed, but when I have went over there he is still in bed with her. 

I am honestly about to throw in the towel in this relationship he has made no motives to move out even with my help..just the other day he went to show me something in the computer and he had a folder of some porn I asked him to show me, we'll turns out he's been taking pictures of said ex while sleeping..in a thong..he promised me that those were before we got together and the dates of the pictures did check out that they're old.

So reddit, what do I do?
<bot>: boyfriend sleeps next to his ex in bed every night, she goes topless and he is a big cuddler..having some issues with it