<human>: My girlfriend of a year (in two days) recently broke it off with me, but already wants to get back together. She said she missed me, missed talking to me, etc etc - all very good things. She wants to be with me, and we are back together for all intents and purposes. She is already using pet names again and holding my hand, etc. We aren't "Facebook" official, but things are going well and it will probably head that direction.
The problem I am having is she kissed another guy, (she had a hickey on her neck) and tells me it is nothing to worry about, that she is choosing to be with me and that basically she realized what she was missing out on with me.
What I am asking Reddit, is for validation. I know in my heart I should forget about it and move on, she chose me. She loves me, I know that. We have talked about marriage before.
But I am having a hard time just knowing some other dude was kissing on her neck and shit. She tells me she that was the extent of it, and that nothing else happened. I am trusting that she didn't hook up with anyone because to quote her, "She didn't have to tell me" about this and that "She didnt do anything wrong, we were broken up." So she probably would have told me if she had sex, I pressed her and she ended up telling me about this.
Ok, TECHNICALLY she didn't do anything wrong. Still, doesn't seem right. She got angry at me for dwelling on it. Like I have no right to be mad, at all. What do you think?

Summarize the given text in a few sentences.
<bot>: Girlfriend broke up with me, ended up kissing another guy, already wants me back, realized what she was missing, do i have the right to be mad?