[vmacosta]

This is interesting. It appears that either I'm blind or multiple posters have misread the situation. PF, UTG+1 limped, called a 3-bet, and then called a cap--sounds like a calling station. The flop came 2 spades, and all of a sudden he woke up and raised--sounds like a flush draw (or wheel draw if he's a total fish...there's some tiny chance of this being a set but players like this almost ALWAYS wait until the turn to raise with their set). Then he passively calls a flop 3-bet. The turn blanks and so he just calls. The river makes his obvious flush and, hooray, he was bet into so he can make the obvious raise and take down the pot! I think you should check the river and calling/folding is close.