Is he interested?

A guy I met in a professional setting- we’ve been speaking casually for. Few months. Anytime I contact him he responds quickly and offers to help me (we aren’t colleagues but we met in a professional setting). We spoke last week and I suggested we get coffee. He said “yea we can talk more about x work topic” smiling and then we kept chatting. At the end of the call on WhatsApp he said “let’s stay in touch” - I cannot tell if he’s being polite or is also interested.

Is he interested?
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