She likes me. Why is she ignoring me?

Ok so me and this girl had been talking for a while. We talked on the phone for months and we started to like each other. So naturally we went on a date. It was awesome. We both had a great time. The next day we hung out again. Once again. Awesome time. I leave town for the week and we talked while I was gone. But when I get back it seems she wants nothing to do with me. She won't return my calls. She rarely returns my texts. What do I do?

But her ex-boyfriend did see us out together. And her parents made her breakup with him because he treated her like crap. Could this have something to do with it?

Any input would be great.
She likes me. Why is she ignoring me?
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