Most Helpful Guy
Human behavior is not strange. Delete that perception from your head as you're not a perfect human being.
Understand that people in general , women and men, all go through various emotional states. And it may not have to do with you as a partner at all.
These emotions make people behave differently. that doesn't make them weird. You just need to be a more humble less judgmental person
Most Helpful Girl
He probably wants you back. Or, he thinks that you still like him, and he wants to keep it that way even if he doesn't like you back, because it gives him an ego boost. He thinks that impressing you will keep you interested or something.