feeling down/..

So the boyfriend and I have been in each other's lives off and on for about 6years but officially together for 3. We have a 15month old and I'm 18weeks pregnant . Last year we fell apart and I told him for a whole week I'm done I don't want to be in this relationship the way things are any more and yes I've said that plenty of times but I told him I was done,still living together,sleeping seperately.i met a guy and we were making plans on hanging out in a group and going to the bars and my (boyfriend..not boyfriend) saw the text and all hell broke loose.....I never spoked to the guy again I regretted it and the boyfriend and I broke up for about a month and then got back togehrrr and decided to try to make it work......now, he doesn't trust me,says that was cheating and were always fighting about something random and that always gets thrown in. The day before Mother's Day we got into it and he ended up saying "why are we even doing this any more" and that he's uncomfortable and that I should look for a place to live with my mom bc he's tired of my bullshit. And it's like he forgot he said all those things bc he's been acting like nothing happened and I don't even know how to approach the situation...it's sad bc I don't even feel secure with him any more. I don't even feel like this is my home and it sucks bc I love my baby so much but these feelings lately have just made me regret bringing another baby into this fcked up situation.....