Guys, Is he really oblivious or is he playing hard to get?

So I have this crush on a guy we were in college together we used to talk on and off, he was engaged at the time so i thought that's why when I've tried flirting he didn't react ( i didn't know he was in a serious relationship. Then he broke up with his fiancée so i started to text him back to see how he's doing and we talked fine but does he really not notice i like him?
Guys, Is he really oblivious or is he playing hard to get?
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