Welcome to PC Hollie123! I'm glad you have found this site, there are many supportive people here. I am sorry you are in this difficult situation. The fact that you have kids makes things a bit more problematic. You clearly have trust issues with him, which of course you would since he admitted to cheating on you. He doesn't sound like a very good boyfriend. He has cheated on you, he doesn't take your feelings seriously. It sounds like your depression/bad feelings are related to your relationship not being good. And if your boyfriend is not willing to seek help or work on the relationship then things seem unlikely to get better. Are there options for you if you were to leave him? Is there somewhere else you can stay, etc...

If you go the other route, and try to make things better, then I think a conversation would need to happen where you told him how you felt about things. I wish you well and hope you keep posting on here!