My girlfriend doesn't want to get intimate?

Hey all,

I am in this relationship and everything is fine. She loves me a lot so do I. We are in the same college. But the thing is whenever my talks come to intimacy she ignores it. And on asking why she just says she doesn't want to do this before marriage at any cost. She asks me to leave her if I am not happy but she can't get intimate. She says she doesn't LIKE it and doesn't WANT to. Also she says she can't see me sad due to this. Now how is that possible to not get want I want and don't even get sad. :/

So people please help me out with the correct reason with explanation so that I can figure what's going and also tell me what should I do.

Another thing is tell me the average time of the relationship to get intimate.
My girlfriend doesn't want to get intimate?
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