My mom had been friends with my stepdad for ages before divorcing. I don't know if total rebound but she's the one that divorced and three months after remarried.

Then there is a childhood friend that is still involved with the friend she had before filing for divorce.

My childhood friends dad is still with the woman he married after divorce, that was 30 something years ago.

There are others that I can think of that were second marriages that have lasted. Not that my 1st two examples don't sound like there's impropriety. Those two examples were/are hardest on the kids involved.