I often wonder if I scare too much once I hit a monster...in this case, did I drop the hammer too early?

Party Poker No-Limit Hold'em, $ CrunchyNuts (10 handed) FTR converter on zerodivide.cx

UTG+1 ($24.75)
UTG+2 ($19.05)
MP1 ($19.05)
MP2 ($26.10)
MP3 ($25.25)
CO ($20.90)
Button ($16.12)
SB ($19.30)
CrunchyNuts ($40.25)
UTG ($9)

Preflop: CrunchyNuts is BB with J, J. SB posts a blind of $0.10.
5 folds, MP3 raises to $1, 3 folds, CrunchyNuts calls $0.75.

Flop: ($2.10) 7, 5, J (2 players)
CrunchyNuts checks, MP3 bets $1, CrunchyNuts raises to $5, MP3 folds.

Final Pot: $8.10