i think the nsa sex ads show that if he's not cheating he is definitly thinking about it. i would say if he hasnt yet, he definitly will if given the oppurtunity. also, does he keep his cell phone on him when your around, if he does then theres probably numbers or texts on there that he doesnt want you to see. just trust your gut on this one, every ex i had who suspected cheating was always right, and i never admitted the truth. but women know, you know your man. p.s. they say once a cheater always a cheater, but we men can be reformed. i'm proud to say that i've been with my wife for 8 years now(married for 6) and have been faithful since the beginning. so there is hope for your guy.