By their actions they will be different around you. they will stop kissing you Etc... And they will be very defencive about anything you ask them. Hope this helps
simply tell the person you are in a relationship with that you are intrested in someone else and just be honest with them and tell them how you really feel.
just tell that person how you fell about that he or she
Get over that person or tell it how you feel.
Tell the person that you are crazy about them and tell them why, or else you'll regret not telling them
Are you the person they were cheating or was it someone else? If someone was cheating you, I would say I didn't want to be their girlfriend (or boyfriend if you are a guy) anymore and that I saw them cheating. If it is someone else that was being cheated, I would tell the person who is being cheated and tell the person what I saw the person do.
Get a boyfriend. Then just tell your girlfriend you found someone else.
tell someone else what you want to say to that person and ask them to tell the person what you would have said to them anyway
Then you can tell them if they are available. If they are with someone else then it would be best to not share your feelings for that person out loud. You will be the one that is hurt in the end, unfortunately. Good luck!
talk to her. see how you can help repair relationship, OR confront and ask why she is seeing someone else and tell her how you feel about it
You let them down easy by telling them you are interested in someone else.
well, i guess all you have to do is tell the person being cheated that someone's making him/her a fool..
No it is not ok. If you tell a person that you own something that belongs to someone else you could go to jail for plagarism.