Women who think that way are usually just a bit insecure. They might also feel offended. If you think about it, it's like you're making your woman out to not be enough. Then again, this is only a misunderstanding (assuming you think she's enough.) In reality, I would just not worry about it and try to do what makes the both of you most happy. If you need to look at other woman, (for whatever reason) don't do it while she or anyone else you know is around.