Oddly flirting

Okay so here goes. Have you ever noticed how someone flirting sometimes makes it too obvious?
Now here is a little background on the subject.
My mother has a habit of flirting with my boyfriends I bring around her.
Same goes for my husband's. I would hope that she wouldn't stoop to the level of sleeping with one of them. When I'm with a man she always tries to break up our relationship and turn me against him. She did the same thing to me when I would date guys in high school. It's like a green Eyed Monster comes out in her.
I'm not jealous of my mother. But sometimes I think she thinks that she is justified to steal a man from me.