100/200 Bellagio

[gakn29]

This happend during the WSOP and I cant for the life of me figure out how I got called down in this hand. Anyways heres how it went.

Im sb with AsQs folds to the button who raises, I 3 bet, bb 4bets with 88, button folds I call.

Flop KsTs3c I C/R he 3 bets, I 4 bet he calls.

Turn 2c I bet he calls

River was some blank I bet he calls.

Im just looking for some kind of reasoning behind such spewy play. In my opinion the only hand he can beat is air which I will have maybe 5% of the time here, but Im a NL guy so please set me straight here. Thoughts?