TBH thesoxwin, I can see what must of been going through your head at the time.
7 players left
5 get paid
1 player all-in for just over the amount of the big blind
Cheap 4 way pot
odds of all-in player busting out against 3 other players is high
First player to act is more or less telegraphing his intentions by checking before the flop is even dealt
You and the BB do the same so now it appears the unspoken "check down" is going to take place
When the turn is dealt you are still going along with the unspoken "check down" even though you have top pair
Ok, so it is all going according to the unspoken plan until the BB fires in a bet. TBH, if it were me sitting in your place I too might not of been too happy about it considering how things had panned out so far.
But, it is at this point I would have to think to myself that BB now has a strong enough hand to be making a play for the pot.
I would probably give BB that look, as much to say, "you better have the goods buddy, cos I'm laying down top pair ( weakish kicker ) because of your bet" and I would then muck my hand.
Obviously no kind of look/stare can be interpreted in that way but you get what I mean. The thing is, everyone is going to see BB's hole cards any time soon anyway, and I'm keeping my mouth shut until I see his cards.
The way it would of ended up then would be that I just say, "nice hand buddy", and mentally pat myself on the back for not saying anything when he threw in that turn bet.
Of course if it turned out that he didn't have my pair of Jacks beat and the all-in player won the pot also not having my pair of Jacks beat, then that would be a different matter and I guess I would be pretty pissed about the whole thing.
I'm unsure what I would say to him then if anything, because at the end of the day I would be well aware that what was taking place until his bet was essentially a form of cheating and I was a part of it.
If you didn't realize deliberate checking down of a hand by 2 or more players in this situation was actually a form of cheating, you do now.
All or most of the posters in this thread would have done it in the past at one time or another, I am pretty certain of that ( they can deny it all day long if they want )
But you verbally discussing it during the hand advertised it was your intention all along, thus confirming you tried to cheat unfortunately.
Posting about it here certainly didn't help matters either as you can now see. So at the end of the day it was a myriad of mistakes on your part but if nothing else you have learned a few valuable lessons which is a positive, right?