Married man is interested in me?

So he's been giving me plenty of signs that he's interested in me but I haven't been reciprocating even though he is very attractive physically, is sweet, kind etc. He hasn't mentioned any woman in his life till now to me but I was told by a mutual friend that he's married though he's not exactly happy in his marriage. His family basically forced him into it it was their wish to get him married so it wasn't a love marriage or anything also he's quite close to my own age and obviously got married early.

Now I don't know what to do in this situation. I fear something might happen between us because I have to spend a lot of one on one time with him at office it's not something that I can avoid and like I said I can't deny that there is clearly mutual attraction between us. Lately he's been asking about my health, taking care of me so I don't over strain myself, trying to do as much as he can to help me, spending as much time with me as he can after work just talking to me and stuff.

Even if I'm working alone I can clearly notice him just hanging around me for no apparent reason watching me for long periods or trying to make small talk etc.

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Also, he just seems so so happy around me he keeps smiling and laughing with me but otherwise he's a very serious kind of guy.
Married man is interested in me?
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