$1.10 mtt, blinds 500/1000 and utg

.
Folded to me and i raise to 4k (i have 5k).
BB insta calls (has 70k)
flop is

BB insta goes all in. He obv covers me,
I insta call.
before i post the results.....good or bad call?
Also looking back through the history, he's made the same move 14 times uncontested. Does that influence any decision?