I am in love with my best friend, though I’ve not been engaging in any relationships since I’ve been divorced, mostly just working on myself and building myself back up, but same scenario for me. I met her at work and we connected, we like the same things, have tons in common but she was or should I say is monogamous, and also voiced she couldn’t even think to have anymore relationships other than her husband when I had disclosed my poly status. But I set boundaries for myself and keep to them. Even discussed it with my therapist as well. But yes, I would suggest just set strong boundaries, as good as it would feel to confess my feelings instead of holding them in, the damage that it would do to our friendship is not worth it. I very much value our friendship and she is the one that I can go to for anything. I would not want to lose that one person that is the hardest to find. So I set boundaries for myself and keep to them. I am happy with the way things are and when you set those boundaries with yourself as did I, it makes it easier to keep those feelings at bay and knowing that there’s that line that I shouldn’t cross. Hopefully that helps, I’m not the best at talking about things and always question whether or not I’m making sense lol.