OK, hold the phones all.
Its a mix. Some casinos and card rooms will force you keep the 2k in the pot, some will not. There are different rules for different rooms.
The
wsop you lose the money, I've seem some Vegas casinos go both ways in their tourneys. And the rules can be different cash game vs. tourney.
Now Roberts Rules Of Poker - a nationally recognized book of rules, states that you can pull your bet back if you didn't know there was a raise. Robert (Bob) Ciaffone created these rules for poker rooms to adapt to have a kinder/gentler
poker game and not so super pro.
http://www.pokercoach.us/robspkrrules4.htm if you want to see the complete guide. MANY rooms have adapted these rules, in fact almost all of
Michigan poker rooms, and I also believe New Hampshire poker rooms use them.
Since this was a home game, as a room manager, I think its a little strict to go by the super pro rules and would have allowed you to pull your bet back...but house rules are house rules so you hosed yourself by not paying attention.
Also dont feel bad, its VERY RARE that you find players that know all the rules.
Oh and by the way - if you said "call" then you owe the full amount of the call, and if your cards are not retrievable (a whole other list of rules here) then you are out of luck and the 4 k