Well Moto, my only advice would be to talk to your boyfriend about it... I know that seems weird, but a bunch of Amiga geeks on the other side of the world are not going to be able to help you as much as someone you love and know really well. If he loves you then he will understand, and hopefully be happy that you were able to share your feeligns with him...
I was in a similar situation a year ago, my g/f said she was having feelings for a man she worked with, we spoke about it... but saddly she decided to stay with me and we've been miserable together ever since. :-D