5 Players left,blinds 2000/4000 (about to go 3000/6000) no ante's.
Seat 1 70k
Seat 2 30k small blind
Seat 3 (me) 36k big blind
Seat 4 45k
Seat 5 45k
Seat's 5,1 and 2 all call the 4000,i check

Flop

Seat 2 goes all in for his remaining 28000
He has seemed tight and only plays when he hits or has big cards.
What do you do in my spot?