Kids all adult so they manage their own relationship with them.
Moving/moved hours away, kids already live away as at uni/working.
Their son the reason for the divorce (not that that is massively relevant).
Ex has a new woman.
In-laws want to keep in touch. I don't really but also don't want to be unkind. Plus it might be hard/unfair to the kids. I won't be travelling to see them so only will if they are invited to things I am going to.
A friend of mine was so shamed about her affair she never spoke to them again even though they never knew she'd cheated.