NLTRN $11 - 2ndPTK, late

[bbbushu]

villain is fairly passive - limps a lot on the button, doesn't semi-bluff when s/he could take a free card instead, etc. we've been playing awhile and i think this is the first check/raise. i c-bet a lot.

PokerStars Game #11454171507: Tournament #58120319, $11.00+$0.50 Hold'em No Limit - Match Round I, Level III (25/50) - 2007/08/12 - 18:59:52 (ET)
Table '58120319 1' 2-max Seat #2 is the button
Seat 1: ACFS (1970 in chips)
Seat 2: babybupkr (1030 in chips)
babybupkr: posts small blind 25
ACFS: posts big blind 50
*** HOLE CARDS ***
Dealt to babybupkr [7c Ah]
babybupkr: raises 50 to 100
ACFS: calls 50
*** FLOP *** [7h Jc 5s]
ACFS: checks
babybupkr: bets 150
ACFS: raises 150 to 300

after my c-bet i have 780; it's 150 to me and there's 650 in the pot. if i call here, should i basically figure i'm committing myself?

if i call here, is there a turn we fold if villain shoves?

thanks,
bbbushu