Please tell me , what i wil do ?

i have met a friend since one and half year..first we share everything to each other...after one year i have propose to her...but she not accepted it and give the reason that as i am the friend of her brother ,she like me and respected me but not love me.....from that day, i am not propose again only keep just friendship relation....,,one day she tell me that she need my educational help , so i will not marry for 3 year ultil her study is not completed...what shall i do ??? do i wait for her ???? or try to find life patner ????