Well, ask yourself this: would she rather or does she spend more time doing other things than talking to or being with you? It's understandable that girls can have guy friends but if they say flirty things to them or they're with their guy friends more than you, more than likely, she's cheating.
If she is secretive about her daily activities, or seems busy more often when you ask her out, it may be that you are not her only partner.
Follow her
tell her.
then he must be cheating on you if he has a girlfriend? i mean if he likes you and has a gf then he must be cheating and wanting you?
We can not know that and thus can not provide you with an answer.
Ask her if shes cheating on you! Nah im kidding i dont know sorry ? :( and im a guy
She keeps her phone and diary away from you.
cheating is doing anything you wouldnt want your wife/husband or girlfriend/boyfriend to know about
Sweetheart, if you who know who she is and possibly lives with her don't know, we certainly do not.
if your girlfriend is out and you don't know were she is you should probibly look for evidence that shes not cheating on you
On a holiday, you would want to spend time with your girlfriend. And if she is cheating, she'll refuse to show up. That is one way to find out. Also, her weird reasons for not doing what you usually do, can imply that she is cheating.
If you have a girlfriend and a boyfriend, then you are cheating on both of them.
tell your brother that you know that his girlfriend is cheating on him and if he doesn't listen to you he'll eventually frigure it out