For its 10-season long run, Friends was jam-packed with lessons about love—​romantic and platonic alike. With a perfectly divided cast for (heternormative) sexual partners—​three guys and three girls—​everyone was bound to get together and they did. Even Monica and Ross shared an accidental kiss. Though it premiered 20 years ago today, when our love life is (sadly) D.O.A., we look back at the best things the show taught us about falling in and out of love.