trust issues

when i was 20 weeks pregnant, my boyfriend left me saying we could see other people. i tried calling him back that nght and he was already with another girl and she was screaming at me on the phone. they then dated for like 3 weeks, During that time i was in psych ward. long story short, we would keep talking during my pregnancy, then he would stop whenever he had someone new in his life, when I gave birth he was dating another girl and didnt bother coming until our daughter was 23 days old. and ever since hes a changed man, he absolutely adores our daughter. we are back together even though he cheated and acted like an asshole. i dont know how to trust him, he lies, and i have a feeling he hides a lot of stuff. a big part of me wants to leave him but we are moving in together in less than a month and without his help i dont know how i would do it. i dont really have friends to talk to anymore i need help thanks. ohhh did i mention he used to ask girls for nudes and kept them in a locked files in his phone.