I thing to use "my life" is better than "my dear" or ""darling".As you know we have for love alot of words.
We also can use for "hayatım" , "my life"
"my soul" can be use too.
"my heart" can be " yüreğim,kalbim"
What can you say for "canımın içi" or for "göz bebeğim"?