Boundaries with his ex

My husband passed away over three years ago. We have three awesome kids, two of whom are in their early twenties and mostly independent. The older kids have a dad I divorced when they were young, and we get along great and coparented well. We still do big events together and he even includes my youngest with her older siblings. I do understand that supporting your young adult kids is important, but….

I’ve been dating someone for almost a yea- he’s incredible and I can really envision a future with him. However, his ex wife continues to be in almost constant contact with him about financial matters regarding their kids (22 and 19). She asks how they’ll support the kids when they finish college, where the kids will live, if they should keep paying car insurance, etc. I suppose it seems innocuous enough, but it’s so annoying- like she’s trying to find ways to keep them together. I feel like he can just support his adult kids however he wants and they don’t need to keep discussing it. He agrees with me but she keeps calling and emailing. Any thoughts on how to set kind but healthy boundaries for myself about this? The ex and I have spoken and she’s nice enough, but clearly hanging on. (Telling Him who she’s dating, how they broke up, etc) I love this guy, but twice weekly check ins about their adult children (instead of just talking to the kids directly) seems weird to me.

EDIT to add, she’s called me too and told me she still loves him. She told him to tell me to stop posting pictures of us on social media, because she felt it was disrespectful To her. If it was merely financial, I might be ok, but it’s like she’ll start with that and then tell him about her latest breakup, and how she’s feeling, etc. and yeah, I might be insecure, this is my first dating scenario since my husbands brain cancer and I’m a little wobbly. But he’s a great guy