I think your WW is more sad about the fact that she is losing her trusty ol' Plan B. She's not sad for you and your relationship, she's sad for her (and she's the one that cheated multiple times).
And she thought you wouldn't give up while she cheated on you with multiple men? Good Lord that just speaks to her mental issues.
She's going to cheat on every dude she's with because internally she will never be happy. She looks for her next high and doesn't care who she destroys in the process.
I would bet a mortgage payment she will try to seduce you once again. This isn't over.
Shore up your defenses if you want any semblance of a normal life post divorce.
