She misses me but never calls or messages me!

Dear Diana,
My best friend from college now tells me that she misses me only 80 per cent of the time. How come she never messages me, in that case? It takes less than 30 seconds to message someone. Also, I don't want to bother her or she may think I am nagging her. She may be busy but still finds time for other activities except for me. I meanu2026 she could at least message me saying she's okay. That's all I am asking for. Are we just buddies for namesakes? When people ask me about her, I say I have no idea. Nobody believes that I am fed up of her excuses. What should I do? I tell her and she says I am wrong about her. If someone misses you so much, shouldn't you give him or her a call or at least message them?

Zaara