I think yo must have discribed this hand wrong,
beacause if he has 42 s i can't see where he has a pair,
do you meen he had 42 suited and there was one 2
on the flop,turn and river or do you meen he had pocket 2's,
and had nothing else then a louse pocket and called you on the flop,
and hit the four of a kind on turn and river!?
Bad luck anyway, just hope you are the "outdrawer" next time.