maybe you can borrow his phone and tell him you will call your mom and look in his contacts or texts if not send one of his friends as a lookout on him that's how i found out my girls was cheating on me
He isn't cheating on her.
you will know if your cheating when you are dating someone and dating someone else at the same time.
Justin Bieber is not cheating on her.
Try, I don't know, NOT CHEATING.
The Patriots did not cheat. Therefore they could not have known they were "cheating".
If they know about each other then no, it's not technically cheating.
Ask her if shes cheating on you! Nah im kidding i dont know sorry ? :( and im a guy
Most likely in the same ways that you might know she was cheating with a man. It could even be less obvious, though, especially if she was cheating with one of her female friends.
atitude
ask him
Follow her
Ask her.