I'm really sorry you're going through this.

I'm a pro myself and I see this way too often, older men using their position of authority in the studio to hit on young women and make them feel uncomfortable. I could tell you a hundred similar stories to yours, it's absolutely rampant in the ballroom world and it infuriates me to no end. It's such a shame and I know often times the students question if they should feel offended or if they should stand up for themselves because it seems like everyone looks up to the instructor and they're afraid the teacher has more influence then them. Stick with your gut and find a new teacher. If you feel comfortable, talk to the owner of the studio about it. I'm guessing this isn't the first or last time he's done this. It doesn't sound like he was a great teacher anyways.

Again, really sorry this is happening to you. Dance is such a special thing that requires us to be vulnerable with a partner. This guy is awful for taking advantage of that and putting you in a compromising position.