I expect she’s still hurting Daz
The betrayal and lies are very very hard to get over and add to that you’ve now recovered, she’s probably wondering why you couldn’t do it for her?
Do you know if she has sought counselling to deal with her trauma? I think she needs to but definitely do not suggest it!
In the meantime just be a good dad. Don’t rise if she makes comments
In time you’ll be able to talk civilly but it will take years
My ex husband cheated on me whilst I was pregnant, 5 years on now. Still have moments I want to punch him in his smarmy face! I’ve forgiven but you never forget that feeling when you’ve been lied to by the person who was supposed to cherish you