Have trouble coming to terms with something

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I have been chatting in a chat room for a few months now, and the community there knows me kind of. Then at one point there's this girl (yes it is a girl, she has revealed her face and voice before) who acts nice through text towards me. I don't really know if she does this to a number of people, and don't really care. The problem I have is that she offered to let me add her on Steam and then Snapchat (I only got the app to add her). She wrote to me herself that she doesn't expect or want anything back on Snapchat which made me feel weird. It's namely this that stroke me the wrong way, I just can't accept it. Why would this person do this? I've never had this happen, so I don't really know how much of a big deal it is (it could be something really small or whatever), but it just makes me feel bad. Why is this person doing this to me? I know I am unattractive and stupid and whatnot, so why? I cannot give them anything back.

I feel like telling them off nicely somehow, but no matter how one could go about doing that I feel like it would make the other person feel like they did some kind of wrong (which isn't the case at all). And if I do tell them off somehow they still chat in the chat room and that would just make things tense and stupid. I don't really know what to say to them...