Need Advice!!: Boyfriend not only cheated, but came inside her!!!

My boyfriend & I of 3yrs. Went through a tough time. He had sex with a girl, a one night stand, and came inside her( supposedly her tubes are tied) When at the time he wasn't coming inside me!!! Bc he didn't want a baby yet. I'm completely destroyed that he was with someone else.. We're working through it. I just found out he came inside a 1 night stand!!! And it broke my heart all over again, in a million pieces. Now I won't let him CI me!!I think it's worse! Then cheating alone! I'm a crazy??? Please, I don't know what to do. I'm sick, my heart loves him. But I hate him!!!