"Should I give the guy who ditched me another try?"

No.  What you call "ghosting" has for a very long time been called "D&D," "devalue and discard," among people who take the time to learn patterns of abuse common with sociopathic and/or narcissistic individuals.   It is so a common pattern that it is absolutely predictable.

This is what is going on: last year he found someone more interesting than you, and now he's bored, or she or he isn't playing along.  He found the appropriate "I'm crazy about him" in you before, and that's what he's looking for now.    

You are going to be really sorry if you don't get rid of him immediately and never look back.  But, you may need to figure that out for yourself.  If you don't get rid of him, the best you can hope for is that you will have a very deep and profound learning experience that teaches you how to avoid these people in the future, and it will be worth it.   But you will always wish you didn't have to learn this one the hard way.