One of the best anti-lovesongs is A Little Time by The Beautiful South (see clip), but Velours et Mensonges by Samir Barris and Vanessa Klak's a good one too. Vanesa (pictured) is the morning jock on Pure FM radio show Snooze, Samir we all know because of that great chanson Le Fossé (available on Gentils Garçons). V and S know each other from waaaay back, but in this song they act like a arguing couple. See teaser video here.
Samir Barris & Vanessa Klak - Velours et Mensonges