What does it mean when a guy never initiates conversation but talks on call for like 2hours?

mimiso
few days ago, i heard a guy's voice on a call (on discord)

and his voice is damn attractive, so i decided to dm him
and i dmed him by saying like"hey , you have a great voice and all" , to which he said thanks and we started texting (I don't know if i was sounding like a creep or something)
i was kinda trying to flirt with him (I think I'm bad at it)
ok so i complimented him few more times and talked about few other things and i told him that I would love to talk on call with him, to which he agreed (oh yesss!! ;))
and we texted till late night
so after 2days , yesterday was the very first time i talked to him on call... we talked for 2 hours (it was fun {atleast to me}, we were laughing and sharing things)
and texted a bit after that
but then he never initiates the conversation (on text), but when i say hi and all he talks me very nicely
and today too we talked for almost 2 hoursi was the one who asked him for a call (both times) i also heard from one of his friend that he has like a thing with a girl (I don't know if she is his girlfriend or a crush) after knowing this I stopped flirting. so should i ask him if he has a girlfriend? well if he really does have a girlfriend then iam just a friend to him. I'm confused right now, i don't know, if he is really interested in talking to me or he is bored or something.
What does it mean when a guy never initiates conversation but talks on call for like 2hours?
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