Feel depressed :(

Olya
I'm feeling depressed, been thinking about stuff my fiance and I have been through 2 or 3 months ago. He showed signs of cheating but I don't know if he was or not. When I started to show him that I didn't trust him he would start arguing like its my problem that I don't trust him and would go out of the house for couple hours. He made me not trust him though, for example, our neighbor (woman) nocked on the door, I didn't hear what she said but he just told me ill be right back. Then he texts me that he has to help her move cuz she broke up with her husband. Then he comes home after 5 hours, sees me all sad and angry at him, I told him it doesn't take 5 hours to move, he gets all pissed off cuz of nothing and as usual goes running out the door. I don't know if I'm paranoid or what. I've asked him if he's cheating on me, he swears he doesn't, but asking him I sent gonna do any better. Girls what should I do?