Hmmm... Really strange that he didn't answer your texts because he had a friend with him. I mean I understand if he didn't have his phone in front of his face and it was on silent but after a while you'd think he would check it and answer. I would expect my fiance to do that, but we do live together and I am sure our situations are different. But you guys are still in a committed relationship. I understand your anger.
And he didn't let you know this friend was coming to visit in the first place. That concerns me

Why did he need to be off the grid for a week while having a friend visit? I don't understand. I am not sure, are you guys breaking up? You said he agreed to talk, I hope I'm not making assumptions. It is okay to feel hatred towards him. Your behavior is inappropriate, yes, but so is his. I really really want to know why he had to be off the grid for a week! I don't get it.