no not really because you didn't kiss him or anything but if u did then u did cheat
if he is cheating he will act in a different manner
Yes, It is, so don't, and tell other people not to do it please!
tell them you don't know that their girl is cheating!! Unless your the guy sneaking around with her!!!
tell him
There is a chance that this guy is cheating. The best thing you can do is ask him or tell the girl what you think is happen.
She looks more at the guy than you. Check her phone.
You aren't actually cheating physically by going out with this other guy, but you are definitely being dishonest by not having the backbone to tell your former boyfriend you care for someone else and that's a cheap shot! Remember, what you wouldn't want to happen to you (such as being lied too and used) the other person wouldn't like it either. Do this poor guy a favor and tell him the truth.
Definitely yes
You tell him the truth! If he is, then why are you still "liking" other guys? Lying leads to cheating.
Tell her that you saw her w/ other guy. Tell her you think it's wrong and mean, if she stops then good no harm done. If she keeps cheating then you know what type of person she is and you know if you want a person like that in your life. I wouldn't tell the boyfriend, let her tell him or not. Answer Remember things may not be what they seem.
You probably can not tell if she is cheating on you, but you can ask her and look closely at her reaction. Talking to other guys is probably innocent and nothing to get upset about.
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.