Sorry to hear that "Love Boy!"
Wait, we are missing something here: first you call her your girlfriend. Then you said that she got married to some other guy. Did you mean your ex-girlfriend? Or, do you guys had an open relationship or were you just dating?
Anyways, I believe in the sanctity of marriage, so this is not the time for you to chase her. There are a lot of "fishes" in the sea, so get a makeover (if needed), get some pep in your step, and "go fishing." Good luck friend!