Look man AS writes about this all the time, of course she feels guilty she is blowing up your family. Any normal human being would. Don't confuse that with remorse. Do you understand the difference.
You guys are separated and what she does that isn't endangering your kids is none of your fuching business. The best thing for you is to start getting out and moving forward with your life like she's doing.
You shouldn't have said what you said but never apologize for something that you meant.