Trust is incredibly hard to gain back after something like this. Personally I think if its once then that could be a mistake and worth working on, but more than once I feel is just trying to have your cake and eat it. If my husband cheated on me repeatedly I'd leave him. Whether I still loved him or not, because there has to be a point where you put yourself first. It's not fair to be treated like that over and over and to be honest, how can that person really care if they're repeating the same mistakes? They saw how much the first time hurt you, why would they want to hurt you again? That's how I see it anyway. I'm sorry if that's not what you want to hear, but I don't see how someone can say they love you if they keep cheating on you. If this were me, I couldn't rebuild trust if it kept happening.