Girlfriend With a Capital "G"?

Anonymous
I asked my boyfriend to define what our relationship was.

He noted I was a girlfriend with a capital "G"

What does that mean? Is there a difference between a girlfriend defined with an uppercase G or a lowercase?

Any ideas?
Updates
+1 y
Thanks for the advice! It definitely meant we were "serious" -- and he meant it in the same way (as a joke) as the British monarchy is referring to the new Princess in waiting -- she was given official status as Girlfriend with a capital "G" :)
Girlfriend With a Capital "G"?
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