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A friend who you send a valentine to, even though they're not your lover, because they're the only one who puts up with your crap.
Hey Lisa, I'm sending you a valentine because you're the only one who doesn't laugh at my bad jokes.
To my bestie, you're like my valentine and my therapist all in one.
I'm sending you a valentine because you're the only one who still talks to me after I yelled at you.