I'm going to go ahead and say drop it, not because what the sister did is acceptable but because OP doesn't seem all that bothered by it. Maybe she can see herself doing the same thing, maybe she has done something like it in the past. If she's not devastated by what happened, and doesn't view the sister as dangerous and needing to be cut out of her life, it is best to salvage the relationship with the sister and avoid the stress a broken sibling relationship will cause their parents and other family.
The husband will need to be jettisoned unless they have kids together, and maybe even then; and under no circumstances should he ever be trusted again. It doesn't matter if OP can put herself in his shoes. The line he crossed goes way beyond mere cheating, and indicates a profound lack of sense and self-control. She should leave him not because he wronged her but because he will always be a source of chaos and uncertainty. However she should bow out as gracefully as possible, and create the impression that his infidelity is not the reason, otherwise he may try to stir up as much drama as he can on his way out.
My Sister fucked my Husband, should I ignore it?
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I'm going to go ahead and say drop it, not because what the sister did is acceptable but because OP doesn't seem all that bothered by it. Maybe she can see herself doing the same thing, maybe she has done something like it in the past. If she's not devastated by what happened, and doesn't view the sister as dangerous and needing to be cut out of her life, it is best to salvage the relationship with the sister and avoid the stress a broken sibling relationship will cause their parents and other family.
The husband will need to be jettisoned unless they have kids together, and maybe even then; and under no circumstances should he ever be trusted again. It doesn't matter if OP can put herself in his shoes. The line he crossed goes way beyond mere cheating, and indicates a profound lack of sense and self-control. She should leave him not because he wronged her but because he will always be a source of chaos and uncertainty. However she should bow out as gracefully as possible, and create the impression that his infidelity is not the reason, otherwise he may try to stir up as much drama as he can on his way out.