In this particular hand you don't want the pot small. When you are ahead in the hand, you want him to call any bet that is large enough to deny him odds to draw to a better hand. If you think he is drawing to a flush, he has 9 outs. For a boat, he has 7 outs on the turn and 10 on the river. You are most likely ahead 60/40, so you have to deny him better than 1.5:1 odds.

Spend $30 and buy NLH: T&P. It's well worth your while...