I've been thinking about how supposedly polyamory "saved" their marriage (per Becky). I'm not saying that Becky isn't a or even THE main contributor to the fucked dynamics there, but she's supposedly had a guy since day one who wants her to go debase herself with randoms.
Like, BPDemons for all their blusterings are terrified of abandonment and will go to extreme lengths to not be abandoned. Becky is certainly a whore and the idea of sleeping around appealed to her, but she has also had a dude since she was 19 saying "yeah sure, go get railed by that guy on FetLife. It gets my peepee hard." I mean could you find a guy who values his wife's body less? He treats Becky like she's worthless. The cuck fetish thing shows disrespect to himself, sure, but honestly also Becky.
It's like how @Diana Moon Glampers talks about how Becky is BEGGING for someone to care about her enough to set some limits and boundaries. But no one even tries.
Jackson is many things but "a person with a spine" isn't one of them.
I'm not a loremaster by any stretch - but unless it was clearly stated otherwise my intuition says this is the timeline and story based on my unfortunate proximity to BDSM communities.
Going back - Becky has always been becky. Jewish LARPing, attention/drama seeking, and a submissive/little "roleplayer". Even her literotica stories and pictures reflect this to an extent. Jackson on his Fetlife advertises as a Dom/Daddy and likely has always been this way as well. Right from the word "go" Jackson was likely lovebombed by Becky as she knew exactly what to do to wrap him up and initially he was what she wanted - a rich, smart, daddy dom. They probably had tons of gross theatre kid sex that made Jackson forget about all of the warnings he had heard in general "don't stick your dick in crazy" and more likely specifically "Stay the fuck away from Rebecca".
However - Becky has a multitude of issues, but one of which is a very poor sense of separating fantasy from reality. Another is a very poor sense of what "roleplaying" is supposed to be and what the boundaries are for most normal people. Initially, in like 2004, Jackson was probably enough for Becky - but the reality starts to set in that while Jackson likes to roleplay as a tough and demanding Daddy Dom - he's literally a spineless insect outside of the bedroom (and likely in it). If you're in a BDSM couple it presents a real problem - how are you supposed to "submit" to someone you know is afraid to send back an incorrect order at a restaurant? Or someone that you know is actually afraid of you? The "I'm rich" fantasy falls apart whenever you hit the "I can't do X because my parents said no" as well. So Becky probably drifted apart from him sexually until she landed on Poly "saving" the marriage. She could get her needs met by someone (in theory) and Jackson could get his as well.
Jackson probably doesn't like it but has probably been taught what happens when he does something Rebecca doesn't like (bad things happen) so it's easier for him to just compartmentalize and treat her like a problem he only has to deal with a few days a week while getting credit for being "supportive" and "understanding".
This is why she gravitates towards "bad boys" like PunningPundit - because she's able to fill in the information with whatever she wants. He isn't "cheating on his wife", he's "so entranced with Rebecca that no rules can possibly stop him" and actually bailed on her when she got out of sorts. I'm sure there have been scores of people like PunningPundit through her life but she likely won't ever encounter anything she's actually sexually compatible with that will also actually like her at all so she has to cycle through them like this. The kind of person she actually wants to be with wouldn't actually give her the time of day so she's just been meeting randos and pretending.
Same trajectory with Daniel as well - he went from "RIOT Rockstar" who was an important person at a famous company, who likely was fucking several company girls - to "broken man" getting dragged on Twitter, BSky, KF, disgracefully fired and now some no name working for some shit game.
Her dying her hair red instead of extremely high-upkeep blue is the first actual sign that Mami and Papi might truly be done with her shit. At least enough to not pay for weekly hair appointments anymore.
SAD likes redheads so this is probably another "fuck you Daniel, I'm SAD's girl now" moves. It's also her giving SAD what he wants so he's less inclined to leave.