A watchdog
As this individual points out, it becomes the trend to look for your significant other when you move in together. They want to reach your partner and believe that you either know where she is or are with her. In a sense, it makes sense. It’s not hard to believe that someone would know their SO’s whereabouts.
If you reach this stage, it could simply signify that you’re ready to live together. It may be a sign from the universe. Or your relations and friends. You should also be aware that once you move in together, such calls will become more common since your significant other is now your roommate as well.