Why did my ex swipe right on me

My ex is so annoying.

We broke up months ago and I tried to have a friendship with him but he was mean to me and didn’t want to be friends.

We haven’t talked in a while.

I started using dating apps. I saw that he swiped right on me on 3 dating apps that I’m using.

So on one of them, I matched with him and messaged him. I just wanted to talk to him. At first he messaged back and talked to me. But then he stopped and leaves me on read.

I’m so confused. Why did he swipe right on me on 3 apps if he doesn’t even want to talk ?