There are a few people (3-4) that I see infrequently and would like to spend more time with, but I can't say I actually miss them when we are apart. From time to time, I sorely miss a good friend who passed away several years ago. Part of this is probably the knowledge that I never will be able to see him again. The only living person I truly miss when we are apart is my SO. I will never tell someone I miss them just for a polite response.