How do you know if you like a guy or if you're talking to him because you're enjoying the attention?

A new friend of mine has come forward and shared that he has feelings for me. We are getting to know each other, and I seem to like him but it is taking me some time to open up. I would hate to lead this person on because that is definitely the wrong thing to do. So how do I tell if I'm genuinely interested and just slow in the process?
How do you know if you like a guy or if you're talking to him because you're enjoying the attention?
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