Fed up with mind games, want advice please?

I am at this point where I met this really lovely girl who I have fallen in love with. She gives me hints that she likes me, I've kinda asked her out before, but not in person. We discussed it and then she suddenly said no. But she always gets jealous if I'm not with her or speaking to her or speaking to other girls. I don't know why she won't admit it, she is quite a shy girl and doesn't like rumours spreading at a school. What should I do?
Fed up with mind games, want advice please?
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