Most Helpful Guys
Some girls use 'cute' to mean 'sweet in a naively innocent sort of way that I want to hug but would never ever fool around with'. That would be a bad thing.
Others use 'cute' as their standard word for 'attractive'. That is a good thing.
some guys don't like to be called cute. The word "cute" can be used to insult a mans masculinity. ... maybe I should put this in terms that'd be easier to understand... When you call a man cute, he'll think that you're going to pinch the cheeks on his face and such. It's like calling a man a boy. Inside we think you're trying to insult us.
Don't use the word cute unless your with your friends, talking about kids, looking at clothes, or with a pet but don't call your boyfriend that. Instead you should just call him babe, honey, hun, etc.
Most Helpful Girl
It seems like guys often don't like it. They take it as rejection or a bad thing when it's actually supposed to be a good thing. If you two are close or he has told you that he doesn't mind, then I wouldn't worry about it.