Im in l’amour with my neighbour who is in l’amour with his gf... But i think he may have feelings for me! I l’amour him and it hurts seeing him with someone else please help me!

Hi!
I am not good about love... Anyway I'll try to help toi (if I can)...
First at all, if toi think he has feelings for you, so toi speak with him ? (don't know how to formulate it, sorry).
If toi do, toi must be sure he really has feelings for you. (maybe not "love" in the meaning of love, but... something.)If toi laugh together (or something like that) toi could tell him something like "yes I know toi l’amour me" (laughing of course). Just to see his reaction. A friend of mine did that and it helped her. Yep, I'm sure it's not easy to say that to someone toi love, but if toi think toi can... just say something like that, without being serious. (complicated to explain I'm sorry).

If toi don't think he loves toi (it sounds brutal, I'm really really really sorry), the best think toi can have is "if he's happy like that, I must be happy for him". I know that it's difficult but it's better than jealousy. He would be embarrassed ...

I'm sorry for two reasons : first, because I'm not good at English (I'm French), and second, because I am not good about love. (I help my Friends but it worked with only two...)
Hope toi understand me ...