Um what should I think?

I think you need to be careful when I was in school male teachers would flirt with a girl in my class and id straight call him out on it like “ dude your almost her dads age” lol then id say “im guessing the only reason you flirt with the young ones is cause you cant get any from your own age” lol he quit after that tear him apart and he will stop or you can be nice about it and let them keep doing it… up to you lol

As mentioned earlier, could just be a compliment. The old guy, he’s a sub so hopefully you won’t have to deal with him again. If the younger guy is staff (u said “my teacher”) then you have to deal with him daily. Just try to keep your distance and don’t approach him unless you absolutely have to. Watch how he interacts with the other girls in class and see if he is doing the same with others. Maybe he just likes fashion? Lol. If you notice it happening with the other girls, talk to them and see what they think/feel about it. If this occurs anymore (and I wouldn’t let go more than once) tell him you are uncomfortable with that and firmly ask him to stop. If he makes any broader advances you need to tell your principal immediately. Hope this helped!! {=