Semi-significant other
A person you are dating casually, but is potentially a keeper.
I thought you and Kimberly were monogamous.
Well, she is a semi-significant other, but we haven't committed to anything yet, so I'll keep trolling while I wait for her to get serious.
Well, she is a semi-significant other, but we haven't committed to anything yet, so I'll keep trolling while I wait for her to get serious.