What's the difference of meet up, hook up and catch up here?

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I have met a guy from Tinder and we met. When he asked to do sex, i didn't want. But he understood and still treat me like a gentleman. When i blocked him at Facebook, he even tried to find me through email (I didn't give him my email, and I don't know where did he get mine), he messaged me like "why did you block me? i can't contact you anymore, please talk to me". And when he visited my country again, he asked me to meet up. Everytime we meet, he always asks "we can catch up again" or "we can hook up soon"", but no intension for sex from him. So, what does he want?
What's the difference of meet up, hook up and catch up here?
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