Costa Rica hasta la vista?

I just start working at my job right now about 1 mth ago and I met a cool, nice, funny, cute guy at work. Say his name is N. We hang out together during lunch and we always talk in the e-mail back and forth. We take the same train everytime we're done from work. The thing is he has a girlfriend and I have a boyfriend. So, I pretend to be not more than friend. Keep everything casual. I don't know he likes me or not and also he is going to move to Costa Rica in the middle of January. He could come back but probably not. :upset: He's going to move over there with his gf, but his gf is going to come back before him. I need advices about what I should do. I know everybody will say that I MUST forget this feeling and keep going on with my 1 1/2 yrs relationship with my bf, but sometimes I can't help to think that probably N is the one for me? I'm a type of person that believe in true love and all of it signs. I need suggestions and I need a band aid for my heart. :upset: