I think what they mean is there are a lot of people, guys especially, who expect women to "fix" them. So when they are in a relationship and still not acting how they should they think the fault and consequences are on their girlfriend/wife, not themselves. It's an effect from toxic masculinity when men don't deal with emotions except with their female counterpart. They want to dump all their baggage on this person, without reciprocating.

I dated a guy who had a list of things I "couldn't" do because it reminded him of an ex. I was not allowed similar requests when it came to my scars from previous relationships, and when I stumbled upon a new trigger for him he blamed me for upsetting him instead of seeing it as a "him" problem