cheers guys...........yes, it was scared betting on my behalf, as soon as I saw the 3rd spade on the turn, I'm thinking, 'oh-oh here we go, he's caught the flush' so I scaled my betting down to see if he reraises me. He didnt, so Im thinking ok, maybe he needs another spade. So on the river, I'm betting to see what he does, as soon as he reraises me I think 'OK, he HAS got the flush' lets get out of here.
It was a great bluff by him(or maybe just a standard bluff anyone would have done against my play?), and I did say that to him afterwards.
As for my 5 x bb PF, Ive noticed Im getting to many callers if I do my standard mtt/sng PF raise of 3-4 bb, so I wanted to isolate someone