I totally get the story line... ***major spoilers***

I dont know about you, but this is what i figured out, and my take on of what went on.

He had a hidden past no one knew about except his friend Jack
he met Sara and it got serious but sara and wendy were already lesbians/friends
wendy mustve told sara about this new guy david at work for their plan to go ahead to steal some money at the bank she works at with david,so she came up with this plan to get sara to pretend shes in love with david and mess everything around, mind *beep* him and wendy mustve met jack, and jack mustve told her about davids past so she decided to mess around with david and that was part of the plan so then sara and her can make him feel like *beep* and want to get away so jack mustve come up with the plan to get back at the bank and he thought yeah why not, the manager/owner whoever the *beep* he was, was a idiot, so he wanted to get back at him, so the plans going ahead,and originally i think david wanted to keep the money for himself, he thought everyone else was too stupid, to know he had a plan, Eric got away because he was seen as the
dumb gay transvestite and didnt care about what went on, and didnt really care
about the money,so if David didnt kill Jack, i think Jack wouldve done it
because if he steals from dead people i can see him being greedy and killing david.

So im not sure if David was going to attempt to kill wendy, but i dont think
he would kill a women, i wanted him too coz she was a bitch, i didnt know
what was going on, but i was surprised she killed him, but that was a set up
by her and sara originally, i wonder though, what would have happened if david
got in first and killed wendy? would sara have done it? would she have waited around for wendy like planned? i could see this movie turning in a totally different light, i was hoping david didnt get shot in the head for a few seconds, so he could come back either in a sequeal, or at the end it says "weeks later" or something, you see him recovered (sara and wendy thinking his dead) and he goes and finds them to put them behind bars or to get the money etc...
wouldve made a good new film or a great ending too.

I have to admit all those different turns in the movie was shocking at the end, because i was hoping for a different outcome, i was dissapointed once i saw wendy walking out of the hotel with the money, but once i saw that she was a lesbian with sara and it was a set up and no one was really hurt in the end but david, i didnt feel sorry for sara anymore and i didnt see wendy as a bitch either, when they got hit by the bus though, i was completley satisfied.

But i still believe if david didnt get shot in the head, and he was able to be stabilised, the movie couldve had a great happy viewer ending with his revenge on the set up.

Just my thoughts and wanted to get them out.