A couple years ago, I hooked up with a friend of mine. Right after it happened, he ghosted me and never talked to me again. He wasn’t even that great of a friend and would leave me on read all the time or just act like I was bothering him. So I realized afterwards that he never actually liked me as a friend and just wanted to hook up. I deleted him from all social media. A couple months ago, he added me on facebook out of nowhere. Why?