Couldn’t get enough of

ATE UP

Think of how someone might eagerly devour their favorite meal, leaving nothing behind. This phrase also describes being completely absorbed by something.

Couldn’t get enough of" hints at devouring something eagerly, like when you love a meal so much you finish every bite. The phrase 'ATE UP' plays on this idea—it literally means to consume completely, but it also slangily describes being totally into something (like 'ate up the attention'). The answer fits because both meanings tie back to not being able to resist or get enough of whatever’s in question.