Ex cheated on me, still hangs around

A little over a year ago my ex (26F) and I (27M) were at my best friends wedding together. We all go back many years to high school. Our relationship had its ups and downs over the past 10 years or so. Amounts college and other things we spent years together and a few months off here and there.

We were at a point of taking a break to “figure things out” but we’re talking daily and seemed to be on the right track. At the wedding I basically poured myself out to her “whatever it takes for us to get here (married) I’m willing to do that”. Fast forward 3 hours and I walk in on her making out with my friend of 20 years. We broke things off shortly after and I haven’t talked to either since.

She’s proceeded to be pretty vicious towards me despite actually 0 coming from my end. 2 weeks later she’s with a new guy and have been dating since. She continues to hang out with “my” friends more than ever before and it’s driving me nuts. I’ve asked them to stop hanging out with her, some have agreed, others have not.

It’s causing great distress in my life. After over a year of therapy, regular work outs and getting back on the dating scene I still find myself ruminating over this and very angry/depressed.

I want to reach out to her but always end up biting my tongue. Can someone please help me or provide some insight.

Thanks.

UPDATE: Wow, this sub rocks. Thank you all for ur responses. I will not be reaching out to her. Nothing good can come of it. However I also now may need to find new friends :(

For clarity, we have been full NC since we split and have only crossed paths once

1 time she started a kickball team with 14 of my/our closest friends and her new bf. It was brutal; Instead of ending it all over a KB team, I decided to start my own with dudes from work.. (guess who we played week 1?)

The only other time I reached out was to ask if she would give me a positive referral for a dog adoption agency (her and I shared a puppy together through same org). She did not respond.

Ultimately this whole post may be less about her and more about the friends. She has shown her true colors and 9/10 times I would prefer to never see her again / hear anything about her. Hence the friends making this difficult.