Is it selfishness...?

hi i m 20 years old girl ..3 years ago there was a clmate of mine who want to do frndship wid me because of my good and helping nature..i said yes to her(as i cant say no to anyone) i was unable to understand human psychic as i was not mature enough at that time...my friend was a highly senseitive person..as our frndsip started...almost everything gonnna be wrong between us...everytime i said sorry to her by thinking that may be the all mess up happened is because of me....gradually my love for her become lesser and lesser but i remaind diplomat with her that i still love her... i dont care whether she call or texted me or not[now she is in another city and am in another]..now its making me feel very guilty..is it really selfishness?what should i do now??