My SO and I are common-law but far as I'm concerned that's as close to legal marriage as you can get so I'll answer lol.
I see this as a possible issue in the future, as does my SO. But I trust that he will try his best to support a gf through those struggles, because we've (mostly me LOL) come a long way from my brush with similar flooding. It will be important for him to reassure her and on my part, it will be important for me to remind him to do so. Sometimes that happens to be the cure.