Mid 40s isn't quite OAP territory. But he is old enough to be her dad, and that's gross.

"It feels like he just sees me as a dumb 19 year old that he can fuck and he is not interested in anything that I have to say"

It feels like that because that's what it is.

This guy is a massive creep. Get away from him ASAP. Men do not get with women nearly half their age because she's so mature for her age, they do it because you're naive and easy to manipulate, and women their own age won't touch them.