How to maintain muscle, but not grow any bigger?

I'm really frustrated. My legs are big enough now, but. I. Can't. Stop. Squatting! I can't stopp adding more weight and pushing myself every time. How do I maintain them but not grow any bigger? I don't want any more size. More on my butt is cool, but I don't want my legas another half an inch bigger!
How to maintain muscle, but not grow any bigger?
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