Girls, Why she flirts with me one day and completly ignores me the next one?

Anonymous
I liked this girl for quite a long time and she knows. Some days she is the sweetest girl in the world, ask me to come around to go for a walk, party, studing or waching a movie, draws hearts in my arm, and notebook, and compliments me all the time, gives me flirty kicks under the table, etc this happens more when we are only the two of us alone. Then the next day she ignores my texts, dosnt say hello or goodbay when she saws me on the street or university, and i feel like i´m a nuisance to her. Then a few days after the same thing happens again she starts to being really frendly and flirty again... sometimes the cicles are longer or shorter but it feels like a loop. I asked her out long time ago when we meet and she rejected me, she has an abusive realtionship with her ex, he leaves her and they start dating again, every few months. I really like her, but i dont understand her behavior.
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+1 y
Yesterday she was talking to me all the day, telling me i have a sexy hair : / , and all the kinds of sweet things. Answering right aways when i texted her, even clingy " ;3 let me know when you're back" , At night i said "Can i come over to see you tomorrow?" "I´m busy" "And the rest of the week?" "I´m busy too" " : ( Something happend?" "No" "Good night. I really care about you tell me if something is wrong, i´m worried". Today she donesn´t answer my texts at all and i know she´s connected.
Girls, Why she flirts with me one day and completly ignores me the next one?
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