I had a very similar thing happen to me years ago. BUT I actually ended up cheating with the co-worker. Oops! I don't recommend letting it get that far. Once that happened I knew I had to end my relationship with my BF. And it was the BEST decision I could have made.

I was just like you... In love and thinking I'd be with him forever. But my feelings for my co-worker were so powerful. And my feelings for my BF dwindled until he was just irritating me. I didn't want him to touch me. It was pretty bad.

When I was going thru it it seemed like the end of the world...But after it was all said and done.... I knew it was right. I have never looked back on that relationship with regret.

And btw... the relationship with the co-worker didn't last either. I dumped him after a few months. lol