....is this a thing?

my boyfriend and i were having an argument about how i feel like he has become very careless in our relationship. like i’m giving 100% effort and he’s been giving 0% in the last couple of months. how ive constantly had to repeat myself about whats bothering me and he never seems to care.

he told me, he is a “go with the flow” person in a relationship.

is that a thing, or does that actually go with what i said in calling him careless in the first place?