Rehab is one thing, but she needs longer term counseling.

Maybe don't respond back for a while longer then lay out what you expect if you decide to take her back. No compromise.

Such as ... 1) Divorce the other guy 2) Mandatory rehab and follow up counselling which she will be paying for. etc.

M-43 W-40
2D - 9 and 5

Emotion, yet peace.
Ignorance, yet knowledge.
Passion, yet serenity.
Chaos, yet harmony.
Death, yet a new life.

RECONCILED AND WISER