I couldn’t catch it, too busy defending myself

from Joe Budden – Ordinary Love Shit Part 3 (Closure) Lyrics on Rap Genius

Meaning

Referring to the previous line he was too busy defending him self from her accusations to notice that she was pretending the whole time and she was the one running around on him and cheating.
Also is a football reference. He is the receiver trying to catch the pass but is also trying to protect himself (as the defensive back) so he drops the ball.

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