Aware of wife’s infidelity but still with her

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Hi all, after some advice really. I’ve been with my wife for 11 years and we have 3 children.
Without getting into the ins and outs too much etc she has slept with a friend of mine several times and performed sexual acts on a couple of guys while away with the girls and at party’s etc during our time together. She texts a lot of guys and after the birth of our daughter got very close with a male friend of a friend and they would text and send each other pics a lot etc.

I was told by a close friend of mine to keep an eye on her and by two of her friends about what she’d done and to check her phone. Which I did and how I found out all of this.
Now to me and everyone else she makes out she’s the perfect wife and hates cheating and would never do anything like that.

She doesn’t know I know any of this but have proof of the things shes’s done but can’t bring myself to tell her I know as I don’t think I want to know the real truth.

She’s gorgeous and I’ve always felt she was way out of my league but I’ve always treated her the best I can and have her a good home and been the best dad to our children I can be but I’m clearly not enough.

Her family are awful and if we ever split up I would worry constantly about them as her mum is an alcoholic and her one brother is in and out of police cells and her other brother has mental health problems so don’t really want them all being surrounded by them all the time if we were to split up.

I love her very much but don’t know what to do it’s destroying me inside and don’t want the kids to know anything about what she’s done or have to suffer because of it.