ask his reason first if you think he's not good enough, just dump him anyway

dump him, there's plenty of fish in the sea who would respect you.

My personal policy is: if you came into this relationship with the understanding that it was monogamous and then he proceeded to act in a way that wasn't -- he violated your trust in the most fundamental of ways. I wouldn't stand for it.

I don't see your relationship working out like that. It would be stupid not to dump him. He doesn't seem to be content with you so you don't have to be contented with him either.

@Rena-Ryugu Drop-kick him down a flight of stairs.

Oh, though now that I think about it, there ARE couples out there who establish some kind of a "One Night Stand" policy in their relationship.

It's basically like, if your partner decides to get it on with another person say, once a month, as long as there's nothing personal going on afterwards, then all's fine. .......I'm pretty damned sure not everyone would be comfortable with that idea.

These are all very good points

I'd say in any case, there is no blanket answer. Even in the case of cheating boyfriends, people can make mistakes. Misunderstandings can be had, and temptation is a difficult thing to resist. I wouldn't say to break up with a person because they make a mistake. It's how they treat that mistake or what happens next.

Does he know you know?

I wouldn't care if he knew that you knew or not. That's not the point. What you're asking is whether you should dump him or stay with him. You wouldn't be asking that if you weren't upset with what happened. (Even though you claim to be numb to the situation.) So the answer I will give you is simple.

Dump him.

@VivoDePyre It's a random thread on the internet. The OP wronged the cheater too if smearing names is a problem here. This thread should have been locked, because if she wanted help theres lots of places she could turn to anonymously. And by that I mean professional help.

@Noodle It's tagged correctly and it's generating mostly good discussion and feedback. Why shouldn't she be able to post a thread like this?

I got cheated on once, I called him up and dumped him straight away!

But don't smash his shit up, break into his house or terrorise him for 3 weeks. Believe me, that shit solved nothing!

@DarkChaplain Yes I am 15, he was 16.

@Lumiex I would say this thread is basically for bitching about her boyfriend and I cant really see much good coming from it. If you actually need help with things like this you don't go to a random internet forum. But that's just my opinion.

Dump him now

DUMP HIM!!!! im new to the site btw ) umm well my bf just cheated on me too and i dumped him soooooo fast. best decision of my life.

@Noodle I don't bitch the people ik just really hate him for the wrong reasons and they straight up say dump him so i wanted to know what most people would do in this situation. Obviously their right.

@Rena-ryugu Of course they are going to tell you to dump him and I think you knew that, but these kind of things are often very complicated. I agree that he sounds like an asshole and you should probably dump him but I still don't see why anyone would come to the internet about these things.

@Noodle Venting your thoughts to someone, online or not, does wonders sometimes.