Ladies please should I worry ???? Relationship

Ok first I’m really sorry but I don’t know what to do and I just need to rant and I’m going to change the names of everyone in this just cause I don’t want to put our real one but here’s what’s happening ....

Ok so I’ve been with my boyfriend (let’s call him R) for a while now and we love each other and before we were (and still are) VERY close and he was dating this girl off an on (let’s call her F) well since we were best friends before we started dating he would tell me about how he feels about her and how much he loved her and all that , ok? Well she still likes him i know this because she’s told me to my face (she’s crazy btw)ok weeeeelllllll here’s where the situation I’m worried about begins R and I go to different vocational schools (his for mechanics mine for nursing) and he’s a grade ahead of me ,well F is now going to be riding a bus to school with him and let me clarify I fully trust HIM I have zero trust nor faith in HER , Ik for a fact she has no problem hurting people and Ik she will CONSTANTLY be make moves and be trying things and grrrrrrrrrr , he already knows that she will be riding with him and he’s PISSED he hates the idea of riding with her, but what would you ladies do ? Thanks for reading