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I don't get mad, I get even. But seriously, I'd move on, if she is important enough for me to date, then I would care about her happiness, if it's with someone else, oh well.
So I wouldn't mind is she left me for another girl, sad perhaps, but not mad - I mean if she's a lesbian she should be with who she's happy with, and they probably wouldn't be a man.
If it were for a very ugly person, well, I'd want to know why. If it was only for money I'd be very mad, mainly at myself for dating such a shallow person. If it were for "love" - well, I'd probably be sad again, but not really mad. Emotions are a tricky thing, people can't help falling in love (ouch, too sugary for my cynical heart)
Congrats, this is worth it. It hasn't happened to me cause that's what I try to avoid. Either I kick first or don't get a girlfriend at all. First I study her image, if she's pretty then means she looks for a king, if she's ugly means looking for help, if she's so so looking for something better than her. So, in my case I wait for her to like me by asking howdoilook.