Clingy former regular client who doesn't buy contents from me

I have a client who has spent almost $400 on me since January, but he’s been stressing me out. I’m thinking about blocking him.

The last time he bought content from me was in early March, but he’s been messaging me almost every day since then—without tipping or purchasing anything. It’s really creepy and annoying.

Please tell me what I should tell him or if I can block him.;(:(

The place I'm working at right now isn't a camming site. (For reference) I don't want to deal with him anymore. He gives me too many icks.