Is My Girlfriend Cheating And Wrong In Her Actions?

She was wrong not to tell you, even if only in conversation, and for her to angry when you ask her about it, isn't good sign. 99% sure nothing happened but you need to ask gf for a little more empathy if you're unsure or insecure. Communication i the key to winning trust. Good luck

You should ask her first, then listen to her explanation and make a judgment. Or it will destroy your relationship.

This is her testing the water. If it was innocent, she would be more concerned about how you felt and the bad perception this gives about the type of woman she is. If I were you, I'd have her move out until she comes back on her knees begging for foregiveness.

I consider cheating to be the betrayal of something previously communicated by BOTH partners.
If you guys haven't both agreed or at least talked about her never being alone with another man, then I don"t see how she did anything wrong here.

It is very simple. Your feelings and concerns have to matter to your girlfriend and they obviously don’t.