AsJc deep facing lots of limps, and then raise calls

[BarryLyndon]

Blinds 60/120

Table has been very limpy and bad and all of that [censored].
MP1 (1,900)
MP2 (2,500)
Hero (6,200)
[censored] (BB) (12,000)

Folds to MP1 who limps, MP2 limps, Hero with AsJc raises to 500 on button, fold, BB calls, MP1 calls, MP2 calls:

Flop: Ks 6s 5s (pot 2000)

BB pushes all in, folds to hero who ????????????????????????

PS: Considering that all my posts are entirely [censored] situations that go beyond the simple "88 does what in the button," should I just quit? I'm getting so [censored] tired of this, I feel like I'm losing it.

Barry