In a relationship but crushing on a colleague

I know this is very far from ideal and I don’t know what I’m looking to get out of this but maybe just some recommendations or words of wisdom.

I started a new job in April and have become really close to one of my colleagues, we are great friends and he is amazing and we just get along so well. We have met a couple of times with friends outside of work and he always books me an Uber back home to make sure I’m safe and walks me right up to my doorstep.

Last night we had our office summer party and something weird happened, and we ended back in the office at 4am and we all fell asleep on beanbags, the thing is that I woke up and we were holding hands.

I know that for the most part that is pretty innocent and I don’t think that it would’ve ever gone past that point based on my relationship but I think he is into me and I am feeling torn as I am in a super happy and amazing relationship, however I can’t stop thinking about the colleague of mine.

Also I think it might be worth adding that we have a couple of business trips coming up and he’s now invited to my boyfriend’s birthday party just to add to the messiness.

Help a girl out please!