inamorata \in-am-uh-RAH-tuh\ (noun) - A woman whom one is in love with; a mistress.
"Neil was the sort of cynical romanticism expert who'd counsel switching from one inamorata to another every few months."
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Inamorata comes from Italian innamorata, feminine of innamorato, from the past participle of innamorare, "to inspire with love," from in- (from Latin) + amore, "love" (from Latin amor, from amare, "to love"). A man with whom one is in love is an inamorato.