To me it is frustrating and angering, saddening and a whole range of emotions. Yet if I say I don't want this then to her I am being controlling and I will get told we are not together and I have no right to tell her how to live her life even if it effects the boys.
No, you dont really have any control over her. But if you are genuinely concerned for your kids, then I think thats OK to discuss.
Do you have any reason to think that they arent safe there? What is your actual concern regarding them?