Regina you may remember a bit better from being in most of a chapter, but Arch you never really got to know. He’s a crop-eared former Fae slave until he escaped borders of the homeland and wound up with some shady occupations in Deluge Rift. This would have been way way off in the storyline from our really MEETING him; like, 2 attempts to kill Sebastian and one rather severe injuring of one another before he clocks out on his Punch Card Villain shift and turn-coats against his own boss in interest of survival.
They meet after he gets particularly injured in a fight – injuries Regina has no IDEA came from fighting Sebastian & Co. – and she accidentally backs into him in her car (which doesn’t actually injure him worse, just surprises both of them). Offering him a ride to get help, she pretty much aids in his get-away, and once he’s actually betrayed his former employer, she sees him more.
Deadpan and gloomy all the way, Regina probably continues to insist it’s not that serious and isn’t really LOVE at least 2-3 years into their marriage, probably right up until they have children.