His ex.

So tldr, my boyfriend has this ex and they dated for 5 years and broke up 3 years ago and she cheated on him so that's why it ended and so, she to this day is very hung up on him messaging him every couple of days saying she still loves him and stuff like that. I have read their messages which I am not proud of, he has no feelings for her and he has made it clear to her several times and one day she kept calling him because she felt "lonely" and "needed someone to talk to" and she wanted to hear his voice, but it's like.. She has a boyfriend also. My boyfriend doesn't know I've seen the messages but I do have her tumblr and im tired of seeing her post things directed and hinted towards him. It's literally driving me insane. I can't tell her to fuck off and I really don't know what to do. 😣