I've got this guy I've known for three years hot on my tail.

He messages me on different accounts, and is very smart about not leaving a paper trail.

He's got a propensity for invading boundaries, and asks questions he shouldn't be over and over again.

He'll call from different numbers, and just say "hello" each time.

It's all very under the radar, and I really couldn't prove it if I tried.

I really don't get "killer" vibes. I think he just does it because he had a crush. I was nice at first, but then he started telling mean "jokes." He got pissed when I pulled away.

How do I react to this?