My bf said he told his ex..

Rylie

That they can't be friends anymore. I mean these two talked evvverday at the beginning of our relationship. (He was broken when she dumped him also she was a horrible gf to him) and so since he told her they can't talk anymore it's been great!!! But last night he posts a post on fb and she liked it. She hasn't done that since before he told her to not talk to him. He was gone all day yesterday and I DONT look at his phone. I trust him and know he wouldn't cheat but man I just hate seeing her name.....

Am I overthinking???