Guys need your advice?

Known this guy for a while. Recently been cracking jokes. Asked why I wasn't at work. Then asked if I was going out on Valentine's day. But the real new thing is we kinda get into odd conversations. Like asked what he doing on day off. He said watching dirty movies. I said oh hope its a good one. Normally we don't talk or joke about that stuff. Is he being flirty. Or just really nosey?
Guys need your advice?
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