This girl

My boyfriend has been friends with this girl for quite some time now and always wanted to be with her. She was never interested in him to date him. He moves on and we date and guess who is now interested in him. (They have slept together)

He tells me he’s no longer interested in her after meeting me and I do believe him.

I’m just getting really uncomfortable with how much she reaches out and texts she misses him and bunch of other drunk texts that are just inappropriate. And all of this nonsense and it’s every couple months she does this. And it’s getting old.

He won’t end the friendship bc they all have this group of friends she’s in. And she’s around sometimes. But would I be out of line to ask her to back off or befriend her or something???? I don’t wanna be rude about it considering this group of friends I’m sure will turn against me 🙄 but like he’s with me, and I’m fed up with it., i find it so disrespectful when girls do that. You know the saying keep your friends close your enemies closer that’s just how I feel right now.