Should I have given this hand up?

[Germane]

6 player table, UB, $1/$2. I'm in the big blind with 89o. 2 seats to my left is a maniac who calls. The button also calls. I check. Flop: 567, giving me the nut straight. I check, maniac raises, button calls, I raise, both call. Turn: 7(567). I check, hoping to induce a bluff from the maniac. Sure enough, he raises. Button calls, I reraise, both call. River: 7(5677). I let out a cry of anguish that nobody hears. I check, maniac raises, button folds, I lay it down. Was this the right move? Too weak? It was only another $2 in a pot that was over $20. On this particular night, the maniac had literally completed every hand against me. Whether it was the set he hit on the river after raising (not even calling) with a buried pair with 2 overcards on the flop which gave me top two pair or his raising on gut shots on the turn and completing them. I was trying to stay disciplined here... I couldn't see how he didnt have a full house, but he did bluff many times (without success). Any thoughts are appreciated.

[GoBrowns]

Its amazing how many times that you just know its impossible for you to win on the river, and you call, and actually do win. I believe its almost always a mistake to fold the river to a single bet in a large pot when you have almost any hand, especially when the bet is from a maniac. Remember, in that scenario, you only have to be right 1 outta 10 times to turn a profit.

[rkiray]

How does the maniac keep raising your checks? Were you betting or was he?

[Germane]

I thought it was clear:

Flop: I checkraise.
Turn: I checkraise.
River: I checkfold.

Argh. I wish I had called... Knowing would've been worth the 2 bucks...

[rkiray]

Apparantly you either don't understand the word raise or the word check. A check can't be raised.

[Nottom]

If he's truely a maniac, he may very well be betting with A high or less. After the button folds I think you have an easy call.