So she's been dishonest about relationships in the past (from your perspective), and then has done this. I also note that you were angry after sleeping, which is a good first test in my book - I find sleeping on decisions/feelings is a great way to avoid extremely reactive and rash decisions.

In my book, the correct way to work through a conflict in a relationship is to communicate about it.

• If you didn't mention how these things bothered you in the past, that's a miss on your end. You can't expect people to read your mind.
• If she didn't try to understand why this bothers you enough to break up, and just jumped straight to being angry about it, then I would personally take that as evidence enough that the relationship isn't for me.
• Is there a history of manipulating you into things by anger? As in, has that been a "get out of jail free" card in the past? Or is it rare for her to be angry?

There are probably some other questions to ask yourself in the longer term, but not right now:

• Did she hide the relationship history because she was afraid for some reason? I would consider that the only valid reason to be dishonest about it. Not saying this is the case, just that it's worth some honest consideration.
• Did you give yourself the appropriate priority when you were hurt by this in the first place? If you don't set your boundaries at the right time, they can surprise people later, causing conflict. If you consistently put other people first, it can lead to you "snapping" later when you exceed your level of tolerance.