help me plz!!!!!!

i had already asked this Frage before about my friend flor and the guy she loved... i decided to help her.. so i used to talk to that guy i thought i will let him know how flor feels and all.. it was going all fine he even started noticing her.. and they even started talking... i was really happy for her... but! now um f*c*ed!! i don't know what he thought oder felt... maybe he got my intentions wrong coz yesterday he told methat he likes me... but i don't... i feel like i've cheated my best frnd..i want to tell her this but i don't want to loose her at any cost.. plz tell me what should i do???