Boyfriend and online trust?

i love my boyfriend. i know he wont cheat on me, but he has this huge problem with online flirting. then again im the one snooping. through his email, myspace, other sites, aim. and he talks and flirts ually with other girls. i did confront him , and he promised not to do it again, but i see that he is. even made up another sn to talk to them(one that im not supposed to know about). should i end this because of online??? a bit stupid, but he's 22 for god sakes, . i get bored too, i dont do that stuff...