Keep trying and never give up!
People you hate him/her or He hate you
Step 1 :Jealousy of you having a caring friend
Step 2 :Trying to get your friend more attention to him/her
Step 3 :He/she will try to talk to your friend more till your friend trust him/her and he will tell your friend not to friend you...
Step 4 :He will one day meet your friend and you he will tell you you did many bad things so that your best friend will start not to trust you and not to have faith and loyality..
Step 5 : Its the end for you :( Your friend might think you really did the bad things and he don't friend you anymore
If you happened this before,please leave a comment. Hope you have your best luck sorting out of your bad and good friends :) Wish you all of luck : Andy = devilrox = Devil