Is he Bluffing?

[bruce]

5-10 nine handed NL. Really don't have any good reads on villian. I pride myself on my ability to make good reads, ie.
catching bluffs and making appropriate laydowns.

I open raise to 35 in late MP. Button calls, and blinds fold. I have around 1100 and button has 850.

Flop comes K T 2 rainbow.

I bet 50 and he raises to 100 and I call

Turn K T 2 4 rainbow.

I check and he bets 150. I call.

River K T 2 4 4

I check and he pushes. What's my best play?

Bruce