Given that he expressed interest in you over a short time period, during which he cancelled two dates without rescheduling, I'm assuming his opinion of you changed, or his initial interest level in you was not notably high. Or, he realized that his priorities precluded him from pursuing you seriously, and thus, he does not want to waste your time.
Because you didn't make a move. He decided to move on. Apparently you aren't interested enough to ask him out.
Either he has severe adhd (he probably forgot you existed), he's a player, he got really busy... stalk his fb or message him demanding an answer.
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2Opinion
a lot of possibilities, may be when he got to know you better he thought you werent that compatible.
or you didn't show interest back
or he got really busy
Probably you just didn't show enough obvious interest back. He assumed you didn't like him much or at all. And he moved on
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