By Breaking Celebrity News Staff

Days after Whitney Houston was laid to rest, Mariah Carey still finds it very difficult to talk about the funeral of the pop icon.

Carey, 41, struggled to find her words during an appearance on Good Morning America Tuesday.  

"I'm almost incapable of talking about this still," the Vision of Love singer said.  "It's very heavy emotionally…"

Carey -- who performed the duet When You Believe with Houston  -- talked of their friendship.

"It was great, and I don't think people could ever understand our relationship ... There was always this supposed rivalry in the beginning and then we did the duet and we became friends. I saw her toward the end. I loved her. We all loved her… May she rest in