I have a problem with men supposedly not doing anything wrong yet they act so freakin' shady...So I don't blame her for being concerned about it, you can't just ignore that type of behavior.
It is very difficult in today's society to know about a cheating mate. I can understand your paranoia about a boyfriend cheating. Sometimes you have to wait and see. Watch his actions, there are many ways they will act when they cheat, although, I'm sure some men or women can cheat and not act like they are cheating. I feel for anyone when they feel their mate is cheating, it's an awful hurtful feeling and no one should have to suffer so.