That bother me, but I never wanna show that
Just don't act like it ever does

from Slaughterhouse (Ft. Eminem & Skylar) – Our House Lyrics 1 on Rap Genius

Meaning

Because the first thing he puts on is the mask

Also notice in the previous lines his temper started rising, but when he got to this line, “but I never wanna show that,” he calms down. Nice literal manifestation of the line in-song…

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