It takes a bit of stationkeeping to stay at L2; like keeping a ball at the top of a low, smooth hill - needs a nudge every now and then. A circular Moon orbit

It takes a bit of stationkeeping to stay at L2; like keeping a ball at the top of a low, smooth hill - needs a nudge every now and then. A circular Moon orbit can last years with no fuel use if you pick your inclination correctly. Look up "frozen orbits" (the Moon is lumpy)