What should I do now?

I've had a crush on this girl for 3 years now and I've only talked to her for little less than a year. i told her i had a crush on her 2 weeks in and she first avoided the question but now she tells me she doesn't want a boyfriend or have crushes on anybody at the moment. i get extremely jealous when she looks at other dudes or when they try to talk to her. she's told me I've made her senior year her best year ever. there's also weeks where she's really happy and weeks where she's in a mood or sad but she never wants me to help her. and im the only person in school she talks to and enjoys being with. I've bought her a lot of things basically spoiling her cause its my way of showing love. school ends in 4 months what should i do?

What should I do now?
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