Kindly help me...i feel guilty?

i am married..i loved my wife...2yrs back i found a not goodloking but inteligent and good girl...who helped me a lot without knowing anything...i also did not discorage that...suddenly one day she told me that she loved me a lot...knowing that i am married...actually i like her as good frnd and i told that i also like u..but..but..she always tried to make me feel good and one day we were both very very close after that i asked her try to avoid that relation..but still bcoz u r good girl i want to be goodfrnd of mine..now for last 1 yr we tried very much to avoid..to some success also..now she also dating a boy..i feel good also bcoz when i saw her some how feel good bcoz she is caring girl..so needs family..now my qs..1.am i a bad boy?2.i alwys try to respct evry girl so that when i thought my past i feel bad for my frnd..what can i do?...really am i did very wrong...??plsss tell me...alwys i want to b a good human being...and alwys do not want to hurt any one