i'd like some feedback about the following scenario...

let's say you're sharing a hotel room with an acquaintance for two nights where your mutual friend is getting married, and you agree to share the room to split the bill and save $. i did that this weekend, and i had a very bad customer service experience that affected me and bothered me enough to bring it up to management and complain. meanwhile, the person sharing the room with me knows nothing about what happened nor that i went to the trouble to complain about it. the room was held under my credit card so i handled the bill, and because of the problem i had they removed the charge for one night.

the dilemma i have is this--because the compensation was solely based on an issue that affected me, and the only reason for getting compensated as i did was because i took the time and effort to bring it up to management, the final bill was much less of course and i had already been given a check by this person to cover their half of the anticipated hotel cost. i think this person may have seen the folio they slip under the door prior to check-out, and i just said that there must be an error and i'd resolve it at check out, but i felt bothered because this person was acting entitled to a refund of half of the money given to me because the final bill was half of what it was supposed to be...but that was all my doing, and this person didn't do a thing or even know why the room was free for one night, and so i don't feel like this person is entitled to benefit from this discount solely because we happened to be sharing the room.

since i took care of the bill only i know the full story, but i don't know if i'm being selfish and unethical by letting her pay what she did and not "sharing" my compensation. if the issue affected her or bothered her, and she were involved in the complaining with me, i'd feel that she's entitled to benefit from the hotel's partial refund just as much as i'd be, but that's not the case. is there any reason she should be entitled to benefit from what happened?

part of me feels a bit conflicted here, so i thought i'd throw it out there and ask for other viewpoints...what would you have done in this situation? do i "owe" her the difference between the expected cost (what she paid me) and the final bill? if so, why? any feedback would be appreciated.....thanks.