JJ river play vs nit

[jj12]

I raise JJ UTG+1. Nit (17/7/2) calls from the blinds.

Flop is 2[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/club.gif[/img] (pot is 43)
Nit Checks, I bet 35 he min raises to 70. I call.
Turn is 6[img]/images/graemlins/spade.gif[/img] (pot is 183)
He bets 90. I call.
River is K[img]/images/graemlins/club.gif[/img] (pot is 360)
He bets 250. Easy fold or call?

I haven't really seen him get out of line but his aggr factor is around 2. I am playing fairly nitty this session