A married man has been hitting on me hard for a long time - what does he want in the end?

Anonymous
This married man has been hitting me for the past half year in various and changing ways.
He made it clear that he both physically and emotionally finds me very attractive and seems to light up when I'm around. He also gets jealous, nervous, insecure, tries to impress me etc. At first he was just very friendly, but then, said six months ago, he started showing interest in me as a woman also.

Even though we are on good terms I never really reciprocated because he is, obviously, married.
But because this has been going for so long I wonder whether he has some feelings for me?
He acts like a little boy after all and can't seem to leave me alone. Also, his way of approaching me changes continually since I'm not responding that positively I guess.
I have the impression that the longer this goes on, the more nervous he gets.

Recently he mentioned divorce in front of me, which was surprising to hear.

Could he be for real? What is this all about?
I don't want to ask him about it because I feel that if he is so scared, he will bail out and act as if nothing happened.
A married man has been hitting on me hard for a long time - what does he want in the end?
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