No, your not wrong in doing this. he is the one doing wrong, but if he don't care then it aint wrong in my eyes. i was in the same kind of relationship and i know how you feel. (you think what you are doing is wrong, but you love him so much you don't care what you do as long as it is with him.)

p.s. this shows a realistic life not a fantasy life, and thats what i like about it.

You may not be doing something wrong but think about the other girls feelings and if pplz find out they mite get cranky at you!!! i know ive been on both sides!!! so good luck whatever you do!!
Sam XD

This is totally effed up, think about how you would feel if you were the other girl, you wouldnt like it would you, my suggestion is to threaten to cut him off from any action untill he dumps the other girl, better to be dumped than to be cheated on