Confused

I recently (i.e. a few days ago)found out,a guy I really liked,really feeling his vibe,has a gf.Long story short we were dating /talking and out of the blue this female msgs me telling all. At the time all I could do was laugh,then I was hurt,then mad.Which I know a majority of womrn have felt this way. Any other dude, I would cut off with a quickness, w/o a second thought. But now,despite everything, I miss him,and want to see him. Is that normal or just crazy??