(((((Hugs))))). That is a lot to go through and I believe you are being very appropriate and mature about all of this. I think you are right and that people are right and this is not as big as you FEEL it is right now. That doesn't make your current feelings invalid. ((((Hugs)))). In time it will feel different....you honestly might be able to look back and laugh at it someday. I had a fantasy crush on a college professor once and was sure we were both feeling it and I made a move and was uncertain of his response and fortunately class ended and I didn't have to ever see him again.

As this guy knows about your bipolar it would not be unreasonable to say something along the lines of "one of the symptoms of my illness is misreading signals. It embarrassing now but I did belief the feelings were mutual at the time. I see now they are not and respect that. I'm
A mature adult and so are you. I hope we can put this misunderstanding behind us and focus on being the professionals we are. Something like that would be fine. It's thorough but intentionally vague without being false in anyway. Stress the importance of being mature and moving forward. You both need to remain mature in this situation and hopefully he will just be flattered and understand. I bet he will. I bet everyone does. We all misread things sometimes. (((Hugs)))