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Came in here to post this. Technically you have dibs because you knew her first. If he isnt your friend then you dont owe him anything. I personally wouldnt ever date or scheme on a girl my friend was with or had dated. If you just know him from working with him a little but you arent really friends then go for the chick. /run on sentence
Even though I feel you don't owe him anything, out of respect, I would keep it on the dl for a while. Nobody likes their ex flaunted on someone else's arm.