Thinking up new sweet nothings is hard work.
Might be easier to find a new girlfriend.
What was it in Pulp Fiction?
"I love you, Pumpkin"
"I love you, Honey Bunny"
"All right, everybody be cool, this is a robbery!"
If you have children: “my baby momma”
If not, there is always “my ball and chain”
”My queen” is also pretty safe.