am I being overbearing?

Selena

i qaabr sure where ro post this but i think this was a good fit. so I have a 17 year old brother. He started dating he is the youngest and I mean really athletic football,soccer,weight lifting, ROTC, wrestling super sporty. he has a girl he likes and I told him to make a move so he did the girl said she had a boyfriend and rubbed his cheek like she wished she didn't and my brother was kind off upset I told him just try to talk to other girls but everyday he gets home and tells me me and Jess were doing this me and Jess were doing that he came home with a big ass bite in his chest one day saying he and her were wrestling and she bit him. if I about that then he gets allowance from us about 50 bucks every week and he spends it with her buying her pizza and stuff he told me the other day that she asked him for a new phone case for her birthday and I'm just a little scared for him the girl is dating a 20 something year old and has my brother as a second plate I told him to just quit doing and buying stuff for her and he says he does but that they are best friends so and today he said that he was talking to a girl and that Jess got mad and told him that he was HER best friend and he couldn't talk to anyone I keep telling him that he should just stay away from her for a while because he is her second 0late the boyfriend without the benefits and in the end he is going to get hurt but I mean I can't tie him to a chair today he is going to the movies with her and her brother the brother obviously wants them to end up together but I don't know this chick has him tied around her finger I mean what do you guys think right now I am done telling him anything its his life but that damn girl gets on my nerves what do y'all think what would y'all do if he was your baby brother