傲娇毁一生

Meaning

In Japanese anime, tsundere characters can't directly confess to the protagonist due to their character settings. They hide their "dere" (sweet) side with seemingly annoying behavior, so many tsundere characters don't end up with the protagonist and are called "loserdogs." Example: the famous blonde tsundere loserdog Eriri. Hence the saying "tsundere are destined to be loserdogs."