What is happening?

I started a new job in October and my boss and I quickly got on well.

Over these months, something has built up. He compliments me, touches me, stands close, likes to tease and make me laugh, we have had longer eye contact and there is often a flirtatious atmosphere between us where we also laugh a lot together. Two of our colleagues have noticed and wonder what is going on between us. At the weekend he wrote to me on messenger and sent me pictures of him and gave updates on his day.

The thing is, he's married. He has joked that his wife will leave him one day, that she will get tired. We've never talked about what's going on between us and I'm not really sure what he wants? How can I talk to him?

What is happening?
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