Sorry, this might be a long'un. I'm 23 and have been with DP for five years. The last two years of our relationship have been long-distance, and have been difficult to say the least, mainly because of DP's reluctance to communicate with me, or with anybody actually. At the beginning of the LDR (we'd already been together three years by this point, so I ought to have know what I was getting into), he refused to use a smartphone so that he could contact me while I was abroad, and said that he'd email me instead. 
After a few months of this, I got fed up and bought him a smartphone and paid for its texts/minutes - writing this down makes me feel like I was a pushover, but I was desperate to have some kind of contact with DP. He used that sparingly for the rest of the time I was abroad.
Now I am back in the UK, but we are still in an LDR. DP wants me to move in with him in the summer, but the situation wrt communicating hasn't changed. He still has the smartphone but will turn it off for about 21 hours a day, only turning it on when he feels like talking to me, or calling out of the blue when I'm busy and then wondering why I don't answer. Everything seems to be done on his terms.
Nobody else can contact him either, if they don't see him every day - during the last two days, his friend and his grandmother have both contacted me to pass on messages to him as they've not been able to get in touch with him. I know this isn't AIBU, but AIBU not to want to be his secretary, and also not to want to move in with him, given that he doesn't want to put any effort into speaking to me? 
I've spoken to him about this so many times before, and he always says 'I can't do any more'. What should I do? 