$1/$2 game in Windsor. I had been playing well and not shown down bad hands, but had also stolen a few pots when the opportunity came up. Details of this hand are hazy, but the gist is as follows:

I limp in EP with (I have ~$300 behind), a few other limpers, SB makes it $15 to go (he has ~$150 behind), I call, everyone else folds. Flop is:



SB checks, I bet out $35, SB check-raises all-in for ~$150.

What do you do?