Me n my net frnd r very close to eachother emotionally.he've gf n i've startd likin him dese dayz.wat 2 do?

One of my net frnds n me r very closse to eachother emotionally. we hav never met each other but chat daily thru net or sms.we belong to different castes n hes got a gf.bt whn i said him yesterday dat i cant b in touch wid him henceforth, he became very upset n drank too. i did so coz i dnt want to cheat his gf as well as i dnt want to lose our friendship. wat shud i do in sucha situation??