200NL going with a read

[savman]

ok i am bb (~200)in this hand with K3. sb (80ish)is way to aggro, he bluffs three streets with SC's into a calling machine. buttton (covers)in the hand plays weird. he has blown me off hands with ridiculous overbets like 2.5X pot then one hand he flops the nut str8 in an unraised pot and checks calls flop and check turn check river all the while i drew to the higher for 2.5bb.

unraised pot

flop

3 3 4 (two spades)

sb leads for 5 dollars i make it 15 button makes it 45 to go and sb pushes. now i am almost certain i am ahead of sb but i cant put button an a hand....i cant put him on a boat b/c he played uber passive when he flopped a monster and there was action b/f and he has been blowing me off hands with god knows what. action is on me.