Did I do something wrong?

this guy told me he liked me a lot more than he's evr liked any other girl in his life well he's mad at the fact that im going out with this guy ,who he hates, and he keeps telling me how he is soo much bettr 4 me than the guy im with now well I...

finally told him how things were bout me and my boyfriend and hoe im not going 2 break up with him ect... well now he's telling me how he never liked me and acting like a total jerk so my question is did I do something wrong??? and why is he acting like this???

You shot him down so he is being an A$$ to protect his ego. Dont worry about him. He still likes you but he is in denial about it.

Guys can be very confusing. They're full of testosterone which can make them very jealous and, at time, a jerk. He is putting you in a tough position. You don't know how to tell him to just back off. He's trying to make YOU jealous and make YOU realize that by not leaving your boyfriend and going out with him, that you are the wrong one. He probably still has feelings for you, but he's being stubborn and he can't move on and just leave you alone. If he isn't a friend of yours, then just tell him to go away and that you don't like him. It is best not to tell your boyfriend about this because it could erupt into a big jealousy thing and it could wind up with them both doing things that they would regret and it would get them in trouble. Ignore the jerk and just spend time and be happy with the boy you like.

He is resentful because you did not break up with your b/f immediately after his appearance. I advice you to avoid that boys who "hates" their rivals. If you like somebody, even your b/f should understand that why you like that person. If not, he will not be a good partner for the life.

aww, he feels threatened and hurt. this is what is sounds like:

he really liked you and you are probably going out with like him rival or arch enemy or somethin, lol. he doesn't want 2 admit the fact that he opened he heaart 2 you and you went in, admired it, broke all of the glass that it was made of and left.
he thinks that the guy you are with is better at somethin than him, maybe better looking, funnier, smarter, taller, he is threatened. he told you how much you liked you and he thinks that you took it as nothing by going out with someone else. he is trying 2 get you to break up with yur boyfriend so that you settle for him. he is trying 2 put yur guy down so that he can make himself look good and you leave him.
he's angry with you for not being with him and is trying 2 b a jerk so that you realize how much you miss having him around and take him as a boyfriend.

you didn't do anything wrong par se, you have a right 2 go out with whoever you want 2, he just doesn't see it that way.
hope this helped.