Thoughts need gone

So this morning me and my boyfriend of 8 years broke up, things were really bad between us..no trust whatsoever, always accusing each other.. I’m p14 weeks pregnant though..it’s hard, how do I get the thought out my head that he’s spending the night with another women..i think he causes arguments so he can go away for a bit makes me wonder if he’s cheating again, can’t sleep, the thought of him with another women makes me want to die. He’s 48 years old and I’m 31, i can’t deal with this