The affair created a triangle between the wayward spouse, other spouse and other person. Communication should be direct, one to the other.
I wouldn't want an apology from his affair partner. I'd want direct communication with my spouse because he's the one I committed my life to. The greatest gift the affair partner can do is leave completely, respect the decision to end the affair (regardless of who initiates it) and live their own lives.
So.. I wouldn't want, expect or be interested in an apology from the affair partner. The focus would be on me and my spouse, working on what caused the need to go out of the marriage.
If the affair partner feels contrite, they can do good for others.. I wouldn't need anymore of their 'help'.
