Speed was found hanged at his home last November at the age of 42 and Bellamy, who played alongside the midfielder for Newcastle and Wales, admits it has "affected everything", including his marriage.
Craig Bellamy: "Losing my best mate has affected everything. I can''t believe how hard it is.
"He was the best mate I''ve ever had. It''s sad but unfortunately it got to my marriage. I''m here and she''s there.
"I don''t know if that''s it for us. All I know is that my best mate has gone. I''m struggling. I can''t lie.
"I can''t tell you how hard it is. It''s the worst time in my life ever."