What should I do?

My bf goes away for work a lot but recently he’s been gone for weeks at a time. He was supposed to be here yesterday but he doesn’t know anymore.

We’ve been together for a while now and i feel like I should be used to it by now but it’s been rough lately. He has a very good career and I could never ask him to quit. And I feel that if I say something it would just stress him out even more or distract him and interfere with his work.

I wouldn’t consider myself a clingy person, but I do miss having him around.