Of course! Don't fall into the sunk cost mindset- you've already found more energy won't fix it. I'd just cut your losses and find someone actually worthy of your time and attention

Well that's my point - they'll be off again eventually. And he'll come back to you when that happens if you let him

I wouldn't though as clearly he's not worth your time

You'd be assuming right I'd say. Prepare to be love bombed when that inevitably falls through and he's suddenly lonely again