My bf still follows his ex even though she has disrespected me
So this is very controversial but my boyfriend was already in a relationship when we started talking and eventually things got deeper and he would tell me he would leave her for me etc.howev before he could even leave her ,she left him for her own reasons and also somehow found out about us.She called me a side hoe to him and just blocked him on most apps.(i know because i was snooping lol) However its been 6 days after they broke ip and we're together but I noticed that he still follows her on little apps he uses like a music app that has a chat option ,a movie app ,and a steps tra ker app that also has chat.i noticed that she does not even follow him back though.One thing I also saw on his phone though was that he actually texted her on the tracker app a day after she had blocked him everywhere.he just sent her a preset motivation text something like " youre killing it" .for more info you have to click the chat first either text whatever u want or click "cheer" which generates an automatic text and then click send.so it wasnt by accident .I also noticed that just 2 days before the break up he was still being affectionate with her and telling her he loves her.i dont know if I should be worried?if this means anything?why would he still follow her knowing she literally insulted me ?
Also dont think I am posting on the right subreddit but oh well I just need opinions
For a little more context they were kind of public somw of his friends and family knew about her too so im kind of worried