I'm going to shamelessly re-post what I posted yesterday evening. Only MadeMan replied and, whilst I'm grateful for that reply, I would just like to garner a few more opinions...
If you did read it and just chose not to reply, feel free to ignore again 
I think I've worked out what my problem is with the man I'm seeing.
And this is more tangible than all my other stuff.
We've had an email exchange today - nice enough. I'm off work today ill - I told him in one of my emails. I also said I feel guilty for phoning in sick. (Always do, I hate it). He commented on the fact that I felt guilty, but not that I was off sick.
Yet, when I was under the weather with a cold and a temperature at his house, he was really attentive and looked after me. He was lovely.
I think that's what it is. It's lovely when I'm with him. But when I'm not there's an emotional distance even when we do communicate. I think I feel like there's a subtext of "don't get too close FG".
There have been more emails this week than any other previously. And he told me last weekend that he was really going to miss me this week.
In the end, we had a reasonably lengthy exchange last night. I think that what I was thinking yesterday evening, along with my other doubts are what is making me think he's just not that into me.
It makes me a little sad to think it, because he is so lovely when I'm with him. But I'd rather get out now, than when I've fallen for him if it is just wrong. I just don't really think he sees me as anything more than someone he spends a couple of days a fortnight with. And whilst he likes me well enough when I'm there, the rest of the time, I'm just not that important.