How to breakup a relationship?

ive been going out with this girl for for about 2 weeks she's 26 im 19 '' were very sexual and we Communicate so well together'' she started to say ''I love you'' one day and i went along with it'' 'but the love i have for her is friendship only'' she's now talking about getting married and my future plans for her '' and she's telling all her friends that im the right one for her" she wants to move out of the state and start a life together ' im too scared to hurt her feelings ' so i keep going along with it ' i think im too nice cause she always gets emotional during these talks'' and every time i tell her no she acts like i dont like her" which is not true '' i told her were better off as friends one day and she got upset and told me to leave '' but the nice person i am '' i made her feel better ' and she now loves me more" I was falling for her until ''she started moving too fast and started creeping me out with constant phone calls and text '' and gets upset whenever i dont call or text back' i kinda dont like her anymore except as friends .'she even pressures me to get a facebook and have photos taken with her'' how do end are relationship without being an ****** ? she's alot older than man and admits she like's younger guys' she tells me she's had her heart broken several times before ' and i can now see why "