A great chemistry I see! Sex is not always required for a relationship. I see 2 possible issues with this. 1st... If you both have a wonderful relationship, but dwell on the past (You are only seeing other people because you are trying to get-over your exhusband, or the same applies to him) then the REAL chemistry between you 2 is not there. Maybe he is just a good friend for you. Nothing more. Hes there for you and through your separation. And maybe you are just his side-track to help keep his mind off of his hectic divorce. BUT IM NOT A PSYCHOLOGIST!
2... You 2 might be attracted to each other but sexual desires are just not there. Heck, maybe you both are alil nervous!
Try having a romantic night, dinner and candles... spice things up! Most importantly, RELAX!!! Look at him as the man that you care for. Give him you and vice versa. See how that goes! Keep me updated!!