<human>: r/relationships, I need your advice..

(I posted this to r/askmen but it was removed because new and/or throwaway accounts can't post apparently)

I've been in an FWB situation for about 3 months and it's been going well. We met because we work in the same industry and have quite a few mutual friends. We hang out, go to dinner, go to bars and sleep with each other. However, I think its time for me to end things because I am starting to have feelings for this guy. I have found a lot of advice on how to confess your feelings and try to make the transition into an actual relationship, but in my case, it is clear to me that he does not feel the same way I do. So, I'd like to just go back to being friends because I feel like continuing as FWBs will eventually make me feel jealous, unrequited love blah blah blah.

My question to you all is, how do I do this?

1.) I don't particularly want to embarrass myself by confessing all my feelings when I already know he doesn't feel the same way. Do I even need to tell him why I want to stop?

2.) I don't want to make him feel like this has anything to do with his personality, sex performance, etc. I don't have any problems with him.

3.) I want to ultimately remain friends. I think he is a good guy and we have a lot of mutual friends so I will have to see him around in the future anyway.

Thanks, all :)

Give me the gist of the text in a nutshell
<bot>: I'm in a FWB situation where I am developing unrequited feelings and I want to stop the sex part without drama and the loss of my friend.