Most Helpful Guy
Its difficult to know , unless his behavior or daily routine changes and it has a tit of secrecy.
good signs he is cheating
you catch in bed with her
you come home and she's taking a shower at your place.
or calls your place and asks if your boyfriend is free tonight
Its difficult if he's a pro at cheating , I never did as I would have been too obvious ,
Most Helpful Girl
There's no definite way. I mean, for me, I knew my boyfriend was cheating when I opened my computer, his facebook was open and a message from a girl came up saying that the lovebite he'd given her was in too obvious a place :P I'd had my suspicions beforehand but I dunno, sometimes they just don't look at you the same way, or they're jumpy or they avoid answering a question dead on. It's about your gut instinct and some signs that can be really subtle.