It is easy for us to say what to do. But you are in the relationship and it can be very difficult to make any decision. Basically, like Trump said, if a person cheats on you once, don't give him a second chance, because he will cheat on you again. For man it is not a big deal. That's what we can't understand. Apparently men can seperate sex and love. Or they just propagate this theory in order to get laid.

But, if you are in a long-term relationship and you are very attached to each other, you need to ask yourself what you want: If you want to maintain the relationship, you need to be prepared that same thing might happen in the future. If you want to get out of the relationship like most of the mm said, you need to be prepared of heartache. And be prepared that there are not so many good loyal men out there. - Loyality is due to absence of opportunity.

No matter what decision you make, no regret is the key.