[Anqew]

3 Bet the flop, He may cap and knock out co or he could just call it back. his range is quite large as MP2 open raiser and JJ is a premium hand so a 3 bet is necessary. This also lets you narrow his hand range w/ his action before the flop.
As for how you played it Id lead the flop hopefully MP2 raises to knock out the CO Then i would Check call teh turn and river aslong as the A or K dont fall vs MP2 HU.