When to fold in this large pot?

[The Legend]

I believe if you read the 3-bet pre-flop section in HPFAP, it recommends calling down when a good flop comes when a preflop 3 bettor bets on the flop. This is because you want to encourage him to bluff with ak, while he makes the least off you with JJ-AA. You can't really raise to protect against mp1 and mp2, so you can let the BB bet the turn for you.

By bloating the flop you gave the other two guys better odds to call on the turn. You don't worry about the 3-bettor since you are either beaten or encouraging him to bluff (and you may get an a or t and draw out).

So , I would call flop, call turn if no kq or j falls, and call river if heads up no matter what, or probably if 3-way and a k q or j falls, maybe fold 4-way if a k,q,j falls. Thats what I'd do at least.