My Boyfriend seems to be slipping away sometimes- hot and cold

My boyfriend and I have been really close for the 6 months we have been dating. He is "the one" and he feels the same. he has some health issues and has been having a run of bad luck for the past few months- health, being laid-off etc. Throughout our entire relationship up to now he has been very attentive- sending cute text messages, spending lots of time with me and telling me everything. We even have decided to move in together in a few months. I have noticed in the past few weeks he won't contact me as often and I will call/text leave messages and never her from him. He will say he received them later but will not respond. He claims he still loves me very much and "we" are the only things going well for him right now, but then he acts kind of distant. Actions speak louder than words so should I be nervous? I have asked him about it and he seems to kind of irritated. What exactly should I do so I am not a pain or overreacting?
My Boyfriend seems to be slipping away sometimes- hot and cold
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