She thought Vance was dead when she married Clint, If she had known he was still alive she would never have married him. Back in those days divorce was pretty much unheard of so that really wasn't a option. Vance was her true love but she knew that there was nothing she could do.
shareConflicted is what I thought.
A little bit of her is sorry for marrying Clint because she obviously has feelings for Vance (ie - she admits in the swamp scene that she will never stop thinking of Vance).
But she never rebukes Clint, suggesting that she does like him too. After all, the film doesn’t portray Clint as a scumbag or a villain; and he was treating her well until he got the idea that she was cheating on him. The suggestion is that, had Vance never showed up again, then she and Clint would’ve lived happily ever after.