I've had this with a boss too.
I got signed off work for a fortnight after having pretty involved abdominal surgery. She rang me several times to "ask how I was...oh, and while you're on the phone, how do I x,y or z" - usually something like "attach a file to an email" - you know, top level high-drama stuff...
I went back to work after this fortnight, still in loads of pain. The woman who'd been doing my work had been shown how to do it by my boss (after I'd shown her how to do it correctly) and it was all wrong, so I had to do it all again - important "OAPs won't get money they're depending on to pay bills and buy food" type work too.
There was loads of other stuff - boss basically not doing her job, handing everything to me, belittling me at every opportunity, etc, etc.
So I was signed off work again, because I'd not recovered from my operation and I couldn't face her bullying behaviour and when I rang her to tell her she asked me to send in my handwritten notes from a meeting I'd attended so she could get the minutes typed up (I said I'd do them and email them to her though because it's nigh on impossible to type up minutes from a meeting you've not been at), then she asked if it was OK if she could ring me "if she got stuck on anything".
Knowing she got stuck on opening the bloody front door of the office, I said that the doctor had said I should have a complete break from work in order to recover from my operation. "Oh, right. So is work stressing you out?" she asked. Well, a bit, I said - because it was more polite than saying "No, you are, you old witch, now fuck off and let someone competent do your bloody job!".
When I returned to work, she'd removed duties from my job description (although it transpired she still expected me to do them...), been slating me to anyone who would listen and had removed a promised pay rise because it had been based on various duties she'd now removed from my job description (even though I was still expected to do these things).
I'm sorry. That doesn't help you much. But it was very cathartic. Thank you!
I'd say he's being unreasonable contacting you. I know that feeling of "OMG, is that her phoning?" when the phone rings - it's horrible and stressy.