I like this boy so much but he already has a girlfriend

RELATIONSHIPKK SO I LIKE THIS BOY HE WAS MY BRO  FRIST THEN BECAUSE MY CLOSE FRIENDS AND NOW M EVRYTHING HE GIVE ME EVERYTHING I  NEED HE LOVE U THAT ONE LOVE IS REALLY TRUE BUT HE HAVE A GF IN GUYANA  BUT HE DONT CARE HE SAID SHE TOO FAR AND IF I DO HE WOULD KIL HIMSELF WHAT SHOULD I SAY WITH HIM OR LEAVE HIM