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.
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?
Only if they don't know about it. I would ultimately depend on the terms and conditions of the "relationships" that you are in. If you are their girlfriend, then most would probably consider this cheating.
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
Justin Bieber has a girlfriend, if he was to kiss another girl he would either be cheating on his girlfriend or kissing said girl on the cheek.
You have to be sure that your girlfriend is a liar (lied to you before) before accusing her of cheating on you. If you have caught lying about cheating then you are wise to break up the relationship with her because once a bond of trust is broken it is difficult to go on in the relationship. Since no individual knows themselves 100% they cannot be expected to know another person 100%.