Here are some quotes about missing friends that I found:

- "A friend is someone who understands your past, believes in your future, and accepts you just the way you are." - Unknown
- "I miss you a little. A little too much, a little too often, and a whole lot more each day." - Unknown
- "True friends are never apart; maybe in distance but never in heart." - Helen Keller
- "Missing someone gets easier every day because even though it's one day further from the last time you saw each other, it's one day closer to the next time you will." - Unknown
- "A true friend is someone who thinks that you are a good egg even though he knows that you are slightly cracked." - Bernard Meltzer

I hope these quotes help. Let me know if there is anything else I can help you with.