The thing is, you don’t know why she is showing those interest vibes.
Although you believe that she appears to be way out of your league, you have no idea what her criteria is in relation to what she deems attractive.
It’s never healthy to instantly judge yourself as not being worthy of asking a girl out and taking her out on a date, based on a preconceived notion that she is way out of your league.
You seriously don’t know what she finds attractive.
Even though you aren’t the only one he is dating and seeing, he expects you to be only dating and seeing him, so as to promote the impression that you belong to him and only him.
He wants to be at the advantage in having several women in his dating orbit.
The idea that any one of them is dating and seeing some other guy is threatening to him.