Communication problems

So my boyfriend and I and generally amazing at communication (we're in an LDR so we sort of have to be). But now I'm having an issue. He's supposed to be coming to see me this weekend after not having seen each other in over a month (which is a short time for us- generally it's every 4-6months). So I've been super excited and really really happy to the point my co-workers think I've been drinking way too much coffee. Anyways, due to a work thing he's not coming anymore. I've been really upset ever since he told me last night. I was at work when he told me so it wasn't a long conversation and I basically hung up on him (I actually did have to go immediately though). He could tell I was upset and he's texted and called me a few times. I've been working so I haven't responded.