When you don’t have a history of talking to guys for hours on the phone, there is a justifiable reason to believe that you actually like this guy.
That said, be sure you aren’t overanalyzing this instead of acknowledging that this guy is merely a welcome relief from a long bout of loneliness and boredom.
It’s possible that if you have been lonely and bored for a while, the first guy who is capable of engaging in fun conversation with you could give you a false impression that you actually like him.
When in fact, the reason for the hours-long conversations has more to do with finally having met a guy who doesn’t bore you in conversation.