Back in 89 me and Kim broke up for the first time
She was try'na two-time me,

from Eminem – Yellow Brick Road Lyrics on Rap Genius

Meaning

Eminem and his ex-wife Kim have broken up, made up, then broken up again constantly ever since the day they met each other. Eminem references this particular break-up in his song titled “Kim” where he raps:

Never knew me cheatin' on you would come back to haunt me
But we was kids then Kim, I was only eighteen
That was years ago, I thought we wiped the slate clean!"

So Marshall must have dealt with Kim cheating on him by cheating on her with another woman.

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