She’d be hurt because she is open to a Polyamorous relationship* and if her husband(s) fell for another man/woman she’d probably be willing to let them into the family so long as they brought it to her. Having a relationship with someone covertly would basically say to her that her opinion didn’t matter.

What she would do in that situation? She’d just talk to them about it and try to overcome it. It probably wouldn’t be as neat as that because emotions and junk but that’d be the ultimate solution.

Or in a worse scenario; They’re having an affair with someone she hates. Which would be unforgivable to her. They’d be excommunicated and she’d probably never talk to them again.

That said; Chris (her only husband currently until I design more) would never cheat on Mama Witch/Molly. He is strictly monogamous to Molly. In fact, it takes a lot for him to get over her having multiple partners.

*To be clear: She doesn’t sleep around. She’s only ever doing it with her husbands and she’s “picky” about who she get romantically-involved with.