Once he gets OW out of his system, he can pick his M back up.
I think the difference to me is that Ruined is leaving the bad H. In his sitch, she is the one who put the pillow between them and said she wanted space, maybe out.
Also, I think O said that he didn't know if this affair was physical, which means it hurts, but it isn't quite a 'full' affair, yet.
If you're the flower, you want to attract the right kind of bee, but you still are trying to attract. A ring says 'I'm here'. Distance and boundaries says, 'but not forever - I've got feelings, too'