a-k spades flop all hearts

so last night i am playing in a live game(1-2NL)... we are at the must move table and there are only 5 of us... I get dealt A-K of spades.. i was second to act it was folded to me I raise to $10. everyone folds the big blind calls. the big blind is a really loose player and to be honest I think an alcoholic... the flop comes A-6-2 of hearts... so i have top pair top kicker... but the flush... that is what kills me ... i notice that the guy looks at his cards... making me think that he does not have the flush cause most people remember that they have suited cards or not .. but this does make me think that he has at least one heart... so he bets $20.. I raise to $40.. .he thinks then calls... him just calling made me think he might have an ace and is looking for his other card possibly a jack or queen of hearts to complete his flush... so ...the turn comes out.. .its the Q of clubs.. not to me this was a scare card cause i was think he might have Ax-Qh... he bets 50.. .i think about it and tell myself this guy is a loose bluffer it is worth the call cause he might still jsut be on a flush draw... the river comes 4 clubs... and he bets 100.... this caused me to have to go into "the tank" ...

I thought about it why would this guy be betting so much on the river it was a blank... what did he call my preflop raise with.. i know he is loose i ahve played with him many times... it is possible that he hit his flush on the flop.. is it possible that his missed the flush but has two pair?... these were all goign through my mind .. after a minute or tw someone calls "time"... and i take another few seconds and decide well it the river gave him two pair so be it there is $300 in the pot and 100 to me ... i call... and he has K-8 off suit... he has nothing it was all a bluff rying to hit another heart... i was relieved.

regardless of the fact that I won and made the right call...
did i play this wrong?
should I have folded?
should I have raised on the turn instead of calling?
should i have reraised on the river?(granted he would have likely folded but me not knowing what he had he might have called with jsut an ace and I might have made more money)