I showed her she's important, finally someone noticed kept her focus
After girls would call her gross and she did the same for me

from Cam Meekins – Don't Be a Bitch Lyrics on Rap Genius

Meaning

The girl (possibly Maggie) that this is about, was important in Cam’s life. The two meant a lot to each other.
It sounds like Cam and this girl may have been the odd one out and have been made fun or bullied in the past and Cam is making us aware that even after they get told mean, hurtful words that they would always make each other feel special, because they were so in love.

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