Your limerence case

 And then there is G., P., and D.. I understand why you miss all three of them. They were not just isolated people. They were connected to a whole period of your life: the pandemic, the lives, the music, the intense friendships and emotional world you built during a time when the world itself was so frightening and isolated. Missing them can sometimes mean missing the people themselves, but also missing the feeling you had. You still linger on the memories because they still mean so much to you. Your love for them remains. You can miss them and know you're not going to be with them, but that doesn't make the pain go away.