A CLEAN AND FINAL ANSWER FOR SOMETHING WEAK IN ME

The milk had turned to lumps.
I drank it anyway.
Waste not, want not.
You hammered that into me.
It came straight back up.
I heard you call me wasteful for half a second.
You were there.
I hated how much that helped.
I changed the final digit before I let it ring.
A stranger said hello.