How do I know if my crush wants to talk , should I ask or what?

Today's his birthday
Last things we said was something like
Me: Happy birthdayy blablah
He: hahaha okay whenever u want
I felt good that (the drug he meant )
Me: awesomee
And that's it since 20:41 , now it's 23:40
Should I keep going to the conversation? I don't know if he is busy, we saw each other only twice.. but I felt like talking to him , we haven't have sex yet, we met at a birthday party.
How do I know if my crush wants to talk , should I ask or what?
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