Turned the wheel

[9cao]

5-max 600NL. Read on Villain is that he is a solid player. Other player in the hand is an idiot. Villain and Hero both have 600.

Hero is dealt A5o in BB. Button calls, SB completes, Hero checks. Pot is $18.

Flop comes K43 rainbow. SB checks, Hero bets $15, button calls, SB calls. Pot is $62.

Turn is a 2 completing rainbow. SB checks, Hero checks, Button bets $6 (does this chronically and I was banking on this).

This is where it gets interesting. SB wakes up now and raises to $25.
Hero re-raises up to $70.
Button folds.
SB re-raises up to $125.

I can't fold here holding the 2nd nut can I or has Villain essentially flipped his cards up? I was thinking that he could have a set here often enough to warrant a call although I expected the river bet to be failry substantial based on this action. Should I consider a push?

Anyways, Hero calls. River is a J. Villain leads for $125. Hero?

Results to follow.