Why does he like everyone else's pictures but mine?

Anonymous
I've been friends with this guys for a few years, and both of us had a crush on the other at some point or another and came clean with it.

When we were first friends he would like at least a picture or two that I posted but since recently, even if I like things he posts on social media, he never returns the favor.

He likes posts by all his exes and other female friends alike, but mine, never. He recently showed up for a party and I got the pictures from the event photographer and he didn't even like pictures of himself. But when one of the photos were uploaded by a friend who was mutual acquaintance of both of us, he acknowledged that. He never hesitates from liking pictures of himself posted by any other girl.

I personally find it offensive if not borderline hurtful. Why do you think he acts this way?
Why does he like everyone else's pictures but mine?
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