[Supafly345]

In all seriousness, any reason they give not to like you is as good as the next. They may not always be completely true, but they always mean the same thing: They are just not inerested.

But, since you never told her that you wanted to be with her (even though acting like a "brother" is a clear sign that you do) she may just think that something like this would make you feel good. She may be thinking that saying that is like saying "There are women that will want to be with you, you know, but just not me."
Sounds like she just wanted to give you some self esteem without sounding like an invitation.

She does care about you at least.