GIRL PROBLEMS! really need help from girls.. easy points?

Ok so I am talkin to this girl whos a sophomre but were both single and she wants to wait to get serious so ive been getting with this girl erica but when she found out she got all mad n i told her if shes not tryin to get serious yet n i am then its not fair to me to get mad. im like fallin in love with this sopre n i told her last night n she told me the same thing but were both comin off long term relationships, n hers was pretty rough. i ordered flowers for her birthday which is soon but is there anythin else i can do to really prove to her that i wanna get serious?