what should i do?

[moonriver]

Well, when i have registered myself on this website yesterday i didn't think that i would post my problem in my love life so soon... But I have to!

To explain quickly what is happening in my relationship, i'm with a guy for 2years and a half, and everything was PERFECT : he always told me that i was the most important person in his life, i felt the same about him, we trusted in each other ... But monday evening, just to laugh and to try, he went to a chatroom and talk to women about sex, i was near him and laughed with him. He created a new msn adress to add those women and started having hot conversation with her. I didn't care because i knew it was just for fun and just for one night.
The problem began when he did the same thing the follow night. He returned on this chatroom and talked to different woman. Just to laugh, i created myself a new msn adress with my own computer and talked to him. I told him i lived near his grand parent's place, and invented a character very hot, sending him photo of a beautiful girl. I told him that I really wanted him to go in my house one week end to have sex and he confesses me some fantasy he never told before.
He kept telling the real me that he talked to women, and i asked him to stop that and to never go there again because i felt lonely and i didn't like the fact that he could be excited by some other girls. He told me he will.
But yesterday just to see his reaction i started to talk to him again with the fake adress and he answered. He told the real me that he needed to go in the bathroom and took his computer with him. Then, the fake me and him had a very hot conversation, and when he came back in my room, he sat in a place i couldn't see what he was doing. He continues to speak with "her", and when he started to be too excited he came near the "real" me and slept with me. Then, he talked again to her and came back again near me, and that 3 times. Then he started to tell the fake me that he didn't love me as much as he did in the past. I was shocked and collapsed by that, i couldn't stop my tears, but i couldn't tell him anything because he didn't know it was me so i asked him to take me some water to make him go. Then, i did as if i were reading his conversation he had with this "girl" and crying in front of him.

He keeps telling me it was just for fun, but how can i trust him anymore ? Am i overreacting ? I don't want to see him again. I feel betrayed. I felt like a sort of sex toy with him yesterday, he came with me when he was too excited, and then go, is it acceptable ? I don't know if what he said about his feelings are true or not, he tells me it was just for kidding but i still have doubt.

[FullofSighs]

Sounds like he is addicted to the "chatting". You really need to tell him he needs to stop doing what he is doing or you will leave him. And if he does it again tell him that the fake you is the real you for proof that he kept doing it after you told him not too and then break off the relationship. He is either gunna go out there and use woman or after a while see that he really lost something true and want to get back with you. Its up to you whether you get back with him or not if that last part happens