An open relationship is never mutual, no matter what they say. There is always one party that is compromising because they don’t want to lose the other person.
If both parties are supporting an open relationship, then there is simply no relationship.
Looks like Sean likes to spread some “Suga” around and his wife has to deal with it. From that video it seems maybe she threatened hoping he’d get jealous and say no, so she would say no to him too, but that plan backfired.