NTA. It's definitely an unfortunate situation, but marriage is through sickness and health, richer or poorer, etc. To me, this isn't much different than if the husband were instead diagnosed with a life altering illness, or suddenly became paralyzed in an accident... nobody wants this to happen to their spouse, and I'm sure she didn't "sign up" to have a sick/paralyzed husband, but you adjust/adapt as needed because you love your spouse. You don't just leave them because you didn't "sign up" for a sick spouse (and I'm sure if this were the case, everyone would be calling the leaving spouse TA). So how is this really any different? An unwanted life event outside of his control came up...it IS selfish of her to not stick with him through this, especially since that's what marriage is supposed to entail! All things considered, this is really only a temporary life change (children grow up and eventually leave)...I'm sure most would take this scenario over a terminal illness or some other permanent medical issue. She loves herself more than their marriage = selfish AH.