Welcome, new friend. You'll have three paths.
1. Faithful Anna won't betray
David. 2. Unsure. She might betray him, but she doesn't have to. David will forgive Anna, and they go to therapy together.
3. The corrupt path is a total whore.
I always find this phrase you use funny: “...David will forgive Anna, and they go to therapy together.”
Did this possible ending spring from your imagination, or did the MP write something like that at some point?
So Anna and David go to therapy after Kendra presents David with evidence of his wife's multiple infidelities. Because that's how most people will play the game. By then, Anna will have slept with half her company, and David will have the evidence in his hands.
And then they go to therapy—yeah, right!
Therapy might work if Anna had cheated once, but not if she's done it at least half a dozen times and there are color photos and videos to prove it.
For David, who still believes that his marriage is not really in danger, that time will save his marriage and heal the wounds, because he has no idea that the person behind this intrigue has direct access to Anna, the evidence (plural!!!) may be emotional damage that in the real world allows neither forgiveness nor healing through therapy. As far as I'm concerned, this idea is ridiculous.
For me, in points 2 and 3, the only realistic option is separation from Anna, whereby the difference between the two points is that in one case Anna regrets the failure of the marriage and in the other she does not.