Unfortunately, many men leave it to the woman to manage the relationship and home life so they can pursue career and hobbies. I know this seems very sexist of me to say that, but it's still very common, and usually guys like that tend to think that just being in the relationship is enough, without making adequate efforts to nurture it.
It's not sexist of you to say that! It's true - and it's the male behaviour you described that is sexist. And thank you for pointing it out.