Se also the Japanese translation of the dialogue in the church. All the moreso it's clear that Aerith herself realises that she's been trying to force a Cloud shaped block into the Zack shaped hole in her heart, but it just doesn't fit. She likes many things, but love? Only Zack.

Nobody hates Final Fantasy VII more than Cleriths.

Nobody hates the characters of FF7 more than Cleriths.