Hi.. no point crying over spilt milk now.. She has made it clear that things between you and her are over.. But that is not the end of the world. From how I read your post.. you were kinda direct to her when you asked her why did she wanna do it with you.. To a girl.. She will feel that you are treating her cheaply.
Don't you find that having sex when you are into a month of relationship is fast? It looks like she is
1) Unable to get over her ex bf.
2) You have done something that she is unhappy about
What ever the issue is now.. You should talk to her not in a persisting manner. In her mind, she is thinking that you are not suitable for her. But it is up to you to win her heart back. But if she insist on the same outcome, my advice is give it up and let go.
Tell her your feelings and let her tell you about hers. Who knows, you 2 may be good frens instead of a couple?
Cheers.

Originally posted by tsubasa82:
Went on a date with a gal a month ago. Everything was great, and we had sex after that. But after the sex, she told me that she only broke off with her bf like 2 mths before we got together. She's not ready for a relationship yet.
So i told her i'll wait till she's ready.
However, she started to become cold towards me when we're in front of friends. I felt that something's not right. Last monday, she told me to give up on her. She said i still don't understand her, but how am i supposed to understand her when she always try to avoid me? I've been trying to talk to her, but she doesn't respond. And she said that we're not suitable and i'm not her type. It's really like WTF.
I asked her why she had sex with me, was i just a substitute. She said that i hurt her by saying that. She did it with me because she really like me that time. But then it's like only 1 month ago.
Now, in front of friends i have to behave as if i'm alright. But deep down inside, i'm really devastated. It really didn't matter to me whether we had sex or not, i really like her.
I really don't know what to do. It's like quite impossible for me to be with her again.