I have an online friend I am suspicious of...am I right to follow my instinct? I could be paranoid?

So we used to im all the time..and then he disappeared for ages..figured it was just one of those online things..whatever..then he tells me he was in diabetic coma (hes diabetic)and thats why he didn't contact me..and he tells me all this worrying stuff about his health..so we email back and forth for a bit and then he drops off the planet again and I email him back that i am worried ..is he ok? wondered whether he had collapsed again..and nothing for days so I rung him cos he gave me his address and all his phone numbers ages ago..and I rung him and hes fine..just doing heaps of hospital tests and medicated and busy and he says he will be there all day sat and sun if i wanna im and he liked hearing my voice...but i am suspicious of him. Even tho hes been nothing but nice and lovely to me part of me thinks its all a load of shite and hes playing mind games with me. What do you think?