My fiance put our engagement & relationship on hold, so why does he still call?

I've been seeing "Will" exclusively for a little over a year now. We were engaged, and looking for a house, but then he got sick. He's on medication, and expected to be sick for a few more months at least. He has MRSA staph infection. It makes him tired and weak. He's constantly depressed, and worried, and I understand that. What I don't understand is why he's pushed me away. I'm even more confused by the fact that he still calls me up, but only when I haven't talked to him for a day or two. He told me a couple of weeks ago that he thought I was "pressuring" him, to live together. I reminded him that he went to look at houses too, and even pointed out some of the ads, and if he didn't feel ready, that he should have told me so, and not agreed to go and look. I told him I would give him time to think it over, and yet he still wants to know where I've been when I haven't called. If I call him, at least half of the time he plays games and doesn't answer.I need help...anyone?