"I like you but I don't know what I want." What does this mean?

Hi, I told a girl who I know for a while that I liked her and I would like to spend more time with her if she also had feelings for me. She said yes, and we had a couple of nice dates. But all of a sudden she stopped returning my messages and picking up my calls. I said I can't carry on like this and walked away, then she came to me and apologized crying. But soon she started behaving the same way again (I mean, hot and cold). When I asked her to explain what's going on, she said "I like you but I don't know what I want". What does this mean and how do you think I should treat her?
"I like you but I don't know what I want." What does this mean?
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