Sorry you are going through this.

Some suggestions from me:

It's obvious you love your wife; you need to show that love and that side ALWAYS right now, that you support her and her decisions. Be helpful with her choices.

Be a happy, positive, confident guy.

Be there for her when she needs it and when she asks.

Don’t try to ‘fix’ things, listen and validate.

I know it hurts like He!!, but her going out all night lets her miss you and think about the great guy that you are. Be the best that can be, become and stick with being the greatest guy on the planet to her. Do it for yourself. Let her be an adult and make her own mistakes without judgments, just support her . I know it will be hard, but be her BEST friend. ‘Act as if’.

It may take weeks, months, years. Follow the DB book and be the best person you can be, to everyone!