What would a girl think if a guy didn't want to have sex

First of all the guy needs to explain to me why he doesn't want to have sex. Because some girls would think that he's not interested on them or having sex with another or whatever. However, if he just wants to remain virgin or doesn't have any interest at all in sex, I would feel proud for him since he values himself more than what his group of friends think (aka peer pressure). I would totally like a guy like that. Unfortunately, there are some girls that would be pissed off :(
but to hell with them :D

I thought my ex boyfriend was getting it somewhere else when he stopped wanting to have sex as often. I think he was just over worked and tired, but still made me think.

I think it's perfectly fine if the guy wants to wait. Maybe he's just not ready and needs some time to get the nerve or maybe he just wants to wait until marriage.

Like he doesn't like her or that he is cheating on her.

I guess it would depend on the reasons the guy gave her. If it was for no reason at all, the girl could just start wondering if it's her fault or somethng. If it's because of your beliefs, or because you're not ready, I think most girls would admire that and understand it.

They will probably think of and consider a variety of reasons why you don't want to have sex. If you tell them why you don't by finding out for yourself, then you can tell them and they will probably think what you say if you explain it in a way that is understandable.

I've known girls that responded well to guys in that situation. It varies from girl to girl, though.