KK facing reraise on flop!

[DonEdison]

played 20 hands with villian and he seemed like a tight/aggr playaaa!

Everest Poker No-Limit Hold'em, $0.15/$0.25 (HH Converter by Kreatief)

Button (46.65)
SB (25.15)
BB (40.30)
MP3 (16.40)
CO (26.50)

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img]
MP3 calls $0.25, <font color="#CC3333">CO raises to $1.15</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $3.85</font>, <font color="#666666">1 folds</font>, CO calls $2.70,

Flop: J[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] ( $8.35 )
<font color="#CC3333">Hero bets $6.20</font>, <font color="#CC3333">CO raises to $15.00</font>, hero?

maby my reraise pf should be bigger, but i do always 3bet raise... so betting more would be obvious!!

who doesnt push?