Am I allowed to be sad?

AJ
So my boyfriend had been off work for a couple days and didn't come to visit me, though he said he would. I can't go visit him because I don't have a car and the bus doesn't come to my town. Today he said he was going to visit me before his shift, but couldn't make it because he was doing laundry. He told me he was going to stop by after his shift, but he just messaged me saying he just got home. Do I have a right to be sad? I feel bad because I understand he has a life outside of me, but... Idk I'm just sad when I don't see him for long periods of time. He and I only have a few months left. He deploys in January. Idk. Thoughts?