why o why didnt I 4bet

[Insistent_]

A call is not a nice option here. He will almost certainly bet the turn again unless he is on a lower pocket pair like 88.
x He will bet as a semi-bluff
z He will bet to protect his hand with a worse hand than yours
x He will bet with a better hand to protect and cash in

In either case, whatever you do you will theoretically do the wrong thing against a large part of his hand distribution.

You have outs and you want to put the money in before the difficult situation. Stick it in!

I think a fold is better than a call because of the same type of reasoning.