Linda is normally portrayed as someone who doesn't think beyond the end of her nose. Very self-absorbed. She apologize for hurting Jim but not for her betrayal of him. She just not get how her decision will and did impact Jim and the rest of her family.
Jim has been a 'normal' working guy, a biker, a "fix-it" man, a super spy, related to gangsters, etc. To me, what makes this story so memorable is that if Jim is just like the reader, we can imagine this happing to us. Did we marry up and of so is there to much of a gap between our Linda and us as Jim?
Or perhaps we just did not know our Linda as well as we thought. The "same old me" is perhaps true, Linda was always just a small step away from taking what she wants at the moment and the husband and family be dammed.
My preferred "Jim" takes positive steps to keep his sanity and his kids close while dealing with Linda's betrayal. This has taken many forms from opening the marriage to a shared divorce where the kids say in the house and the ex's have their own place somewhere else.
Using these basic plot points, hundreds of alternate endings, story settings, character behaviors are explored. Some stories are BTB, others RAAC and all points in between. What I am offering are few unexplored avenues that I believe are worth exploring.
Recently there have been a few (2?) stories where Linda's and Jim's parents are at Jim's house when the love birds return. I really liked this twist to the story. Linda can't shade her adventure when their parents are firsthand witnesses to her whoring around.
** Plot Point 1 - Linda telling Jim directly she's leaving with Marc **
In all the stories, Linda sneaks out the back without a word to Jim. How would the plot develop if she had the foresight to approach Jim (with or without Marc's accompaniment) to inform Jim of her intentions to return the next day. To paraphrase many cheating wives "I just have to do this. It won't change anything between us dear."
If Linda does this, does it show her understanding of what she is about to do or is she delusional? The discussion and/or pronouncement of her (Linda's) decision would be enlightening.
** Plot Point 2 - Linda saying more than one night **