so me and my boyfriend were together for a year an half we took a break recently. while we were apart he was talking to his ex. fine. we weren't together. but now that we are back together she continues to message him every morning as soon as he wakes up. I've told him MULTIPLE times nicely that he should speak up and let her know it's no longer okay to do such things and he has yet to say anything to her even thou he always says he will.

I'm wondering if I should just message her to let her know what's up not be rude about it but explain how it's disrespectful to continue to do such things and I'd appreciate it if she would stop. opinions?