I found out that my boyfriend is cheating on me but he doesn't know that I found out the truth.
Why is your boyfriend cheating on you?
He's trying to hurt me and he only cares about himself. I guess I'm not enough for him.
It's terrible that he's cheating on you. That's wrong of him to try to deceive you like that. Tell him that you know and discuss your relationship.
I'm going to tell his family about what he's done and hopefully they'll tell him he's wrong.
Telling his family is fine, but you should confront him first. This is very damaging to your relationship and your self-esteem. Don't suffer in silence any longer.