Cheating..

My boyfriend of 1 year cheated on me on Saturday, Sunday morning he came to my house bawling and saying sorry told me what happened and how he was up all night with a gun to his head 😢 he also told me about things he hasn't even admitted to God yet like his brother raping him when he was seven he says he has no feelings for the girl and I believe it cause I've known him for 3 years n her for like 2 and I understand that getting raped by his brother definently affected him I forgave him and we are still together but I told him if it happens again he isn't getting another chance, the hardest part is having my heart broken but I can't tell anyone because if I tell people about what happened they won't approve of him anymore but it's just hard and idk what to do