Elly > Status Update

Ladies (and Gents) I need your help....I read this book a long time ago and I can't think of the name but want to reread it.

Synopsis: A widowed woman goes through her husbands things (?), only to find out he fathered a child with a ONS (I think) and he was keeping in touch with the child and month and visiting like once a month. He was actually killed in his car on his way to visit the child and OW.