This guy has 3 bet like twice already in first 15 hands, I know i played this bad. Should I just be 4 betting pre? I was concerned because this 3 bet was much less than the other 2, which he made 200. He also randomly made it 100 on the button one hand..

PokerStars Game #26793158931: Tournament #153803675, $55.00+$2.50 Hold'em No Limit - Match Round I, Level I (10/20) - 2009/04/06 14:28:03 ET
Table '153803675 1' 2-max Seat #2 is the button
Seat 1: SERNE (1600 in chips)
Seat 2: sachit (1400 in chips)
sachit: posts small blind 10
SERNE: posts big blind 20
*** HOLE CARDS ***
Dealt to sachit [7c Ac]
sachit: raises 40 to 60
SERNE: raises 80 to 140
sachit: calls 80
*** FLOP *** [2s Kc 6h]
SERNE: bets 80
sachit: calls 80
*** TURN *** [2s Kc 6h] [Qh]
SERNE: checks
sachit: checks
*** RIVER *** [2s Kc 6h Qh] [8c]
SERNE: bets 160
sachit: folds
Uncalled bet (160) returned to SERNE
SERNE collected 440 from pot
SERNE: doesn't show hand
*** SUMMARY ***
Total pot 440 | Rake 0
Board [2s Kc 6h Qh 8c]
Seat 1: SERNE (big blind) collected (440)
Seat 2: sachit (button) (small blind) folded on the River