Guys im confused about this 'indecisive' girl? (but i really like her)?

ok so there's this girl im going out with. we went out about 5 months back, it didn't last long, only a week aha, but at least we tried. so we have been going out for a week tomorrow, but she is really indecisive, she told me yesterday that i want you when im not with you, and i dont want you when im with you, then she said, yes. yes i do want you. i got confused and said look, just tell me straight, she said i don't know, im really indecisive. So today we made a cake, and it was fun fun fun :) but after the cake, she seemed, annoyed, and really quiet, and i don't know, maybe a little pissed off. she even almost forgot to kiss me goodbye, when she left! i don't know man. i know i love her, i think i should just end it! what shall i do guys? i need all the help i can get. if theres anymore information you need, just say. all i want is advice :)