Originally Posted by Hurt213
Do I pick up on her smalltalk when we are together with the children, I mean by that, should I be happy, content and be cheerful, or do I just answer as short as I can, and show her, that I really don't want to talk to her ?


You do both. I think that's the part you're missing. You can be cheerful, content with her while still being brief. You answer her question politely but don't elaborate or add anything new.

Originally Posted by Hurt213
The only reason I am so much in doubt is, that if she ever feels remorse and talks about R, and if I at that point in time want that, then I want to stay clear of doing dumb [censored] such as ignoring her, if I really should be paying attention to her - I hope that makes sense.


This is connected to part 1. You aren't ignoring her. You aren't being short or rude. You are responding to her politely and maybe even cheerfully depending on your mood - but you don't add small talk. You don't talk about your R. You don't talk about your feelings or hers. You talk about logistics.

The idea of W feeling remorse and wanting to talk about R is not a current worry. Perhaps in the future - but that is NOT now. And if she does want to R she will be able to reach you, even if you end up being "short" with her a bit now.