Should I put myself out there and give this a shot or try and move on?

There is this man that I've known a few years, on the professional level, and we were pretty close. He recently went through a divorce and began showing interest in me as more than a friend. However, the workplace was inappropriate as it could jeopardize his job. I also wasn't sure if he was just having fun, being recently single. The flirting began to decrease as I'm sure he got weird signals from me. I was getting ready to quit the job and during the last month or so I knew I was having feelings for him, and to make my departure easier for me (so i thought) I began to avoid him and act as though he was just another person. He never said anything, he just continued to flirt subtly when he got a chance, and this left me very confused. He asked for a hug one day before I left, but we never really just had our goodbyes. I have quit about 2 weeks, and I'm miserable. I'll probably never see him again enless I go out of my way to head to the job for some odd reason. How do I handle this?