[Rivière]

It sounds like you're in quite a difficult position at the moment. Sometimes it can be hard to get over someone especially when we think so much of them. Have you or he ever discussed how you actually feel? If you haven't, it may be a very good idea to because you can both get an understanding for the situation you're currently in. When you see him next, see if he can spend some time alone with you and talk to him about how you feel, ask him how he feels. I understand that he has a girlfriend but people are not limited to those who they're with, for all you know he may be going through a rough patch with his girlfriend and is just seeking comfort somewhere else until he and his girlfriend work things out.

If you feel like you don't want to talk to him about how you feel and if you really would just prefer to move on from him then really, either you change your mind and choose to communicate with him or find a way to never see him again. From what you've said, you seem fine when he's not actually around you but when he's there this is when your feelings for him start up. Have you considered purposely spending a long preiod of time away from this guy? It may help you to move on from him and find someone who is more suitable and readily available. After all, this guy does work away and so even if both of you were to become closer, he wouldn't exactly be around all that much for you and bearing in mind that you're currently at school, the time you'd see each other would be limited.

All in all, find the confidence to talk to him about how you feel and try and get him to open up to you about how he feels too but remember to be realistic, as much as you think the world of him, if he isn't going to be there for you or you for him, then the relationship even if there does end up being one, may suffer.