If you want to sound a little old-fashioned, you might refer to your girlfriend as your inamorata.

A woman you love in a romantic way is your inamorata, although it's not a very common term these days. It would be a little startling if your friend said, "I'd like to introduce you to my inamorata," though you'd know he meant "the woman I love." The male version of an inamorata is inamorato, which is even more rarely used. Both words come from the Italian innamorare, "to fall in love."

Definitions of inamorata

n a woman with whom you are in love or have an intimate relationship

Type of:
a person who loves someone or is loved by someone
adult female, woman
an adult female person (as opposed to a man)

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