Trust issues

Lately, I've been having really bad trust issues with my boyfriend due to previous things that happened in the past. He tells me I have nothing to worry about and that he is loyal to me but he also said that to me and then I found out later on he wasn't being loyal, he wasn't cheating but he was doing things he shouldn't while in a relationship. I talk to him all the time about it asking him if he's loyal  and making him swear but idk, I just have really bad trust issues, I love him a lot but my trust is just idk with him, I wanna trust him but he has to really prove it. Any help or suggestions on what I should do or tell him? 🙁