What should I do about a girl I like?

Alright, so I met this gel at Six Flags over the summer and I got her number. We been talking ever since then. We usually talk everyday unless she is busy. I'm a snowboard instructor at a place called Camelback in PA, and I asked her if she wanted to come try snowboarding and I would give her free lessons and teach her how to snowboard. But I am starting to really like her and I don't know if she likes me. While me and her were talking I had a gf and she cheated on me a couple days ago. Then I told her about it and she got mad at me for not telling her that I had a gf.. Does that mean anything? She isn't mad at me anymore but she was. But now she says she can't wait to come try snowboarding and can't wait to see me again. I wanna ask her out when she comes up to snowboard but idk if she likes me or not.. Any suggestions? And also she doesn't have a bf. I asked her..