An interim girlfriend is an acting, associate or "kind of" girlfriend, until better a better girl comes along, or in some cases, the guy and girl will become full "boyfriend and girlfriend."
Or it can be referred to as a girl who isn't a guy's girlfriend but acts like it.
My interim girlfriend acts just like a 100% girlfriend, and she even does my laundry.
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To be temporary or in the place of
I think you should be my interim girlfriend.