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A fallback is a friend who acts like they're your buddy, but when you need them, they ghost you or side with someone else. They're the type who laugh at your jokes but run when you're in trouble.
You asked them to come to your birthday, and they said no because they were with their ex.
You cried to them about your break up, and they told you to move on and then blocked you.
You needed help with a test, and they said they'd help, but then they never showed up.