A) see if friend who is always busy is free
B) see what other friends are up to
C) long phonecall with person who breaks up,
or needs to vent about their relationship at
least once a week
D) errands/last minute plans/nap
E) "can't miss" game/movie/show on tv
F) spend time with you
Don't be someone's Plan F.
If you're not important enough to them to be plan a or b, they shouldn't be important enough to you to sit around waiting until they have nothing better to do than spend time with you.
You're more important than that...
even if they don't ever see it.
Always remember that.