Why is she so hot and cold?

This girl I've been texting for awhile now has been really hot and cold. At times she seems really interested and we will text each other a lot, then sometimes she doesn't seem interested at all and won't text back so I stop texting her.

This has been going on for a few months since I've known her. I've talked to her a bit when I see her at parties, but otherwise we haven't hung out. I tried hanging out with her several times back when we talked the most but our schedules never worked out.

Any comments or advice?
Why is she so hot and cold?
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