Emotional Anthony Joshua met Oleksandr Usik in Jeddah on Saturday
Said that he was "disturbed" by his performance as the Ukrainian heavyweight champion.
Usyk claimed his WBA, WBO, IBF and IBO heavyweight titles.
Britain retained with a split-decision victory over Joshua,
Joshua told reporters, "It's really hard for me to say
Joshua tosses Usik's two belts down after the final bell before leaving the ring,
Only to return later and deliver a passionate speech.
"When you try and work with your heart, not everyone is going to understand
Joshua explained. "It was just from the heart. I knew I was mad at myself.
Not on anyone, only on myself. I felt like I had to get out of here.
"You can do stupid things when you're angry.
Then I realized it was a game. I came back and did the right thing."