If you like a girl, would you tease other girls in front of her but not her?

So there is this guy, we occasionally work together. From our previous interactions and the fact that we always make eye contact, I get the sense that he might have a crush on me. This guy is kind of growing on me however he constantly playfully teases my friend (who also works with him) in front of me. She is happily married and has a child and has never shown any interest in him. He is aware of this. I don’t understand why, if he sends me interest signals, he does this in front of me all the time. Is it to make me jealous? Is it because he likes her?

If you like a girl, would you tease other girls in front of her but not her?
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