His ex is requesting to follow him

He “dated” her years ago. According to him it was only sex, no relationship. She has his name tattooed on her. When we started dating she was still trying to call and text him. I had to tell him to block her. She then started reaching out to him on Instagram and I had to tell him to block her on there too. She then messaged me and I asked her what the nature of their relationship was. She lied and said “I haven’t fucked him… yet 😂”. That clearly shows her intentions. She also said that she will always be in his life, that she’s his “best friend” and for me to get used to it. He said none of that was true and he called her a bitch. It also led to trust issues because, at the time, he was taking vacations without me back to his home country (where she lives; we were teenagers) and I didn’t know what he would do when she’s making herself blatantly available to him. I blocked her Instagram. Now we’ve been together almost 5 years and I see that she requested to follow him on a new account. He hasn’t accepted it but he hasn’t rejected it either. Should I mention it to him that he should block her or should I wait to see what he does on his own? Im sick of telling him what he should do as if it’s not obvious already. He’s grown now but I still feel like he won’t do anything until told. I’m trying not to mention it but it’s really bothering me.

I’m struggling because as sad as it is, I feel like he won’t do the right thing until I tell him too and I don’t want things to be that way. And in these past years she has had a baby with somebody else, yet she’s still stalking my man, it’s weird and annoying.