Why does my sneaky link always block me after sex?

It’s so strange I never had the issue before. I don’t hear from them after sex and they block me on every social media and blocks my number after sex and completely stops talking to me. We usually hit each other up for sex when ever we need. What is the issue here if it happens a lot? Sneaky links could usually turn into more sometimes. I want to be friends with them but it doesn’t happen if they keep blocking me after sex. He is definitely single and doesn’t have a girlfriend or is married. Because this doesn’t happen to most girls.