What are the best things to do to make a guy miss a girl?
What would make you miss a guy? Probably the same things. However, if someone cares about you and likes spending time with you they miss you even when you're with them. Sounds weird but it's true. When you like someone that much you miss them constantly, regardless of where they are.
Go to a place he frequents, have another planned to meet you there, walk around acting emotionally distraught, until you find "the non-boy friend" guy. Fall into hi arms sobbing, tell him ahead if time to affectionately console you.
The best way to make him miss you is to perfect your bob and weave technique.