Is he trying to get with other girls

My boyfriend got a email account last week and we emailed each other a couple of times and I never thought about him talking to other girls or anything well Monday of this past week he told me that he wasnt going to use his email address anymore that he...

was going to get another one...So I went into his account and changed his password. well I went into yahoo messenger and some girl was on there, and I asked her who she was and she told me her name I asked how she got my email address, you know pretending to be him and she was like do you not remember and I said no shes goes you gave me your phone number and I gave you mine...Then I noticed that he was getting emails from like accesslove Mate1 and adultfriendfinder so I went into his acounts on those and he had put on there that he was single looking for fun...and he use to tell me that I would never have to worry about him on the computer because he would never do that stuff that finding girls on the internet wasnt his thing...I havent got a chance to talk to him about it because he hasnt called me in 2days im not aloud to call his house because his aunt doesnt like me...But I dont get why he is doing this?! He seems happy with me. He tells me that he loves me wants to spend the rest of his life with me and that Im the best thing that has ever happened to him...and then I also noticed on Reuion he had been searching for his ex girlfriend...Im really confused...Can anyone help me why do you think he is doing this?! Help please!! What do I do?!!

he is using u as a back up...if his other relationships dont work out he comes to you.about the ex girlfreind thing he maybe wants to get back with her