I wasn't even thinking about cheating necessarily (which yes, would be just awful), but a scenario in which Jean-Paul just randomly shows up in a book one day and mentions he got a divorce off-page, and that's all the set up the writer uses to pair him up with Bobby. I feel like that would be a cheap way to get those characters together.
I wouldn't be against that either, but that would still require a story focused on their marriage and how it got to that particular point, as it's not the kind of thing it's been suggested before.