As you'd expect from something with this title, The Misanthrope is a kind of manual in how not to do it, if by "it" you mean "friendship." Which we do. Friendship seems to a have a lot of meanings, anything from an exchange of services (Oronte's influence for Alceste's adoration) to a code word for enemy (Célimène and Arsinoé BFF for life!) to stalking them to the ends of the earth and making them behave exactly the way you want them to (Philinte and Alceste). It makes sense that "friendship" is just as fraught as love, because "friendship" is just another way of describing the bonds that keep people together—and "people" is The Misanthrope's main obsession.
By the standards of the play, only Philinte and Éliante actually show true friendship.
The Misanthrope suggests that friendship is a relationship of exchange.