PokerStars No-Limit Hold'em Tourney, Big Blind is t300 (8 handed) Hand History converter Courtesy of Poker coaching - Get an online poker lesson - texas holdem strategy for real poker

saw flop|saw showdown

SB (t8225)
BB (t8402)
UTG (t11528)
UTG+1 (t16776)
MP1 (t9610)
Hero (t5745)
CO (t2549)
Button (t6653)

Preflop: Hero is MP2 with , .
2 folds, MP1 calls t300, Hero raises to t1200, CO calls t1200, Button raises to t2100, 2 folds, MP1 folds, Hero calls t900, CO calls t900.

Flop: (t6750) , , (3 players)
Hero checks, CO checks, Button bets t4528 (All-In), Hero folds, CO calls t424 (All-In).

Turn: (t11702) (2 players, 2 all-in)

River: (t11702) (2 players, 2 all-in)

Final Pot: t11702

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depends on my read on the button imo. CO is a tard who just called half his stack so he's going to be coming for the ride. AJ is iffy holdings in a three handed pot. If I think button's range (for a minraise, mind you) is solid I fold to the 3bet.

Things seem to be fine. The mini-reraise suggests a high pocket pair like KK or even AA, or simply a donk. You do have the pot odds to call.
The flop check/fold is quite standard. You missed it and give up.