Maybe it's just me, but in your situation I would have had problems with the chick after she left me and went back to her ex. There is no staying friends after that.
But then, I've never been able to stay friends with a chick once I've had a relationship with her.
That settles it, you are gay.
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Some people are like slinkies, they aren't really good for anything, but they still bring a smile to your face when you push them down the stairs.