My parents have been married for 50+ years, my father likes to spout off about how my mother is the one true love of his life at every given opportunity. Yet he's had 3 affairs that I know about, and still talks fondly of the last OW (his secretary, who sadly died a few years ago, estranged from her adult children because of the affair). When my mother was making her will, she told me that her assets were protected from my father being able to get his hands on them, because she knows that he's the sort of man who'll have another woman in the marital home, with a ring on her finger, quickly - and she wants her children and grandchildren to inherit, not some random other woman/her family. Conversely, if my father were to die first, my mother's said that she'd stay single until death.
My ex left me with a 12 and 4 year old, literally on the day his OW had their oldest child, so he definitely moved on very quickly.
My daughter's current partner, was engaged to the mother of his new born child, when they got together 5 years ago. They tell everyone that they've been together for 4 years, because for the first 7 months of the child's life, my daughter was the OW, the 20 year old newly postpartum ex was fighting to keep her family together (he proposed to her, whilst carrying on with my daughter, too, apparently) and the bloke... loving it. And the kicker is, that they also set out to male everyone think that the ex was crazy/psycho, when the poor kid was probably just begging to have her life back; the stable two parent home for her child... (And no, I'm not proud of the behaviour/attitude displayed by my daughter -she knows first hand what it feels like have the rug of fidelity swept from beneath your feet, and to do it to a young first time mother when her baby had virtually only just been born? Despicable, in my opinion.)
It's interesting, though about the accommodation aspect, though. My parents only got married (6 weeks to the day of their first meeting) so that my father could move out of the barracks (Army) and into a married quarter when he was posted abroad. I refused to let my ex move in with me, because as much as I loved him, I knew I'd wind up in prison if I ever lived with him. He lived with his parents, whereas I had my own place (where the children resided overnight). When he and the OW had their first child (she's from Slovakia), the ex-inlaws gave them a house to move in to. And my daughter has a house, where she pays for everything, whilst her 30 year old gamer boyfriend reaps the benefit of her doing everything for him (literally - he had a hernia operation, really simple procedure, my father and son have both had exactly the same operation and been back on their feet within a week... this man amongst men actually asked my daughter to wipe his arsehole for him. Sad thing is that she probably did, she's so desperate to keep hold of him). He's a cocklodger, who prior to moving in with my daughter, had lived with his parents, or with the ex at her parents. But yes; I agree accommodation has to be a part of it, surely!
As for me, it took me well over a decade to start another relationship with someone, because of the hurt my ex caused - I've never felt such rage, twinned with devastation, before... and felt them whilst doing my utmost to keep my kids lives running as normal. It emotionally damaged them both, in different ways.