Weird betting when I have a flush
 

I have a read that villain called a big raise pre-flop with J9o and other than that I think he's pretty loose. But I don't know if he's aggressive or not in general.

Everest Poker No-Limit Hold'em, $2.00/$4.00 (HH Converter by Kreatief)

MP2 ($406.10)
MP3 ($264.80)
CO ($755.92)
Button ($80.00)
SB ($372.00) (Hero)
BB ($46.80)

Preflop: Hero is SB with J[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img]
<font color="#666666">2 folds</font>, CO calls $4.00, <font color="#666666">1 folds</font>, Hero calls $2.00, BB checks,

Flop: 7[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] ( $12 )
Hero checks, BB checks, <font color="#CC3333">CO bets $4.00</font>, Hero calls $4.00, <font color="#666666">1 folds</font>,

Turn: 9[img]/images/graemlins/club.gif[/img] ( $20 )
<font color="#CC3333">Hero bets $20.00</font>, <font color="#CC3333">CO raises to $40.00</font>, Hero calls $20.00,

River: 8[img]/images/graemlins/diamond.gif[/img] ( $100 )
Hero checks, <font color="#CC3333">CO bets $100.00</font>, Hero calls $100.00

Re: Weird betting when I have a flush
 

I can't think of anything better than what you did here.