Girlfriend broke up with me

Hi everyone!am bothered and want your suggestions and advice with regard my difficulties in finding true love.although I meet this girl name ruth some month back,she came visiting and realised she dated a friend but never let that to put me bacck towards her.not quite long we dated for just a week though there was sex but foreplay! After a week,she cchated me and said if we could be friends cos she tried hard 2 love me but she can't and it's better we continue our friendship.i love her and want her to be with me and dnt know what to do cos she's still in my heart.not thinking about sex but want a serious relationship and want to prove that I can mk a good relationship.what should I doo