Should I assume?

Specifically, should I assume that the guy who likes me also has fantasies about me? He's a friend of mine, we're both Christians and never discuss sex/anything like that. We're both virgins, neither of us have dated before. We only have talked in group settings but I know for sure that he is crushing on me, and probably has been for a couple months.

Since he's a teenage guy, should I just assume he sees me and likes me sexually? And if he does, would it be wrong for me to dislike him for that?
Should I assume?
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