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Most straight tragic relationships in media are at the start or halfway, to motivate the (often male) survivor and raise the stakes. The Bury Your Lesbians trope is often part of the mid to end game.

Not to mention, non-tragic straight relationships are still way more common and to have this relationship built up over several episodes end this way is really playing into the trope.

Edit: also, the trope was born out of straight-up homophobia from the censor-boards that controlled a lot of US media for ages because one of their guidelines was literally that non-straight relationships weren't allowed to work out or result in lasting happiness for fear that it would "encourage" girls to be into girls.