GUYS PLEASE BEHAVE, WILL YA?

Hi. I never denied the fact that I love my bf from my previous posts.. but I dont know, sometimes I get so paranoid thinking as to who he is with, knowing that were far from each other. A while back I checked his friendster account and his network in yahoo and the name Sherry always come up. I dont know whats the deal but Im kinda thinking he's not being faithful... or maybe its just me being paranoid. I want to build my future with him one day... but I dont know. Can a guy really stay unattached while away from his girlfriend,stay away from temptation? Can his "manhood" needs wait? I need an honest and straight answer specially from the guys so I would know what to expect...Thanks!