Boyfriend's girlfriend sent him the song good for you

My boyfriend had a girlfriend he admitted he treated like shit and cheated on with everyone. He said he was in a bad place and now that he's in therapy he's healthy and happy. We are having a baby and he's been posting about it on facebook. Well he got a message from her on his facebook saying congratulations with the song Good 4 you by Olivia Rodrigo. This was so childish. We are 27 and he broke her heart 11 YEARS AGO! Who is this crazy that they are still obsessed with a boyfriend fromm 11 years ago. He sent her a thumbs up and blocked her.