Pregnant and stressed. What should I do

How can you be with someone you don’t trust? That’s right you can’t. Here I am at 5 weeks and I feel like everything my boyfriend does is shady. We’ve had issues in the past & now my instincts are so strong that he can’t even leave the house without me bitching that he’s cheating on me. He has this ex of 5 years and I still feel like they communicate but I can’t talk to him without him saying I’m “obsessed” with her or the situation. I just feel like I should get out of this relationship. I’m losing my mind. Rant over😪