But things change when you get older
She started drinkin' cause I ain't sober
That's when I told 'er
"Be careful 'bout the friends you keep
Cause the ones you call friends ain't friends to me"

from Big KRIT (Ft. Melanie Fiona) – If I Fall Lyrics on Rap Genius

When they’re older she knows KRIT is drinking and smoking a lot so she starts to do the same to try to fight the pain… he is saying that the friends she has are not his friends and could in fact be enemies, this could also be referring to dudes she is fucking on the side

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