How do you know if your long distance friend likes you?

He jokes about hooking up with me- but we've been friends for ages (like six years) and see each other only every 2-3 years. He can go like 6 months without talking to me, but then spend his whole work day emailing me back and forth and flirting.

I know he cares about me- and is there for me, to talk about anything- but he's coming to visit. and I can't tell if he's going to make a move.
How do you know if your long distance friend likes you?
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