its good that u can lay down big pairs.
his range for plaing like he did is AA,KK,AK,65s,77,44(on turn quite unlikly),and very very unlikely KQ.
according it was 4way flop u have to judge for urself if he goes in with speculative hands pairs,connectors, this was good situation to go in, even with his stats.
so ur ahead of AK,65s... prolly not the worst fold. especially oop. in position u may call that weak turn bet.