You are

You  are:
peanut to my butter,
water to my ocean,
glaze on my donut,
spring in my step,
twinkle in my eye
cherry to my sundae,
flip to my flop,
milk to my cookie,
sweet in my dreams,
beat to my heart,
cheese to my macaroni,

best to my friend,
LOVE OF MY LIFE.

:D