mosp, I don't think I've questioned his motives per se, I think I may have said you don't know what he's really like, it's entirely possible that he's presenting the HIM he wants you to see... he can re-invent himself to you and that would mean that one person thinks he's a good person. If you write to that 'good person' then it becomes real to him.
My crux of the matter is that it is causing you anxiety, so therefore you need to review the situation.
Side anecdote. I was in abusive relationship for over 10 years. Ex left a year ago. I have recently (and kind of on a whim) started internet dating. I got treated poorly by one guy I thought was just beyond fabulous, we messaged every day for a month, all day, every day. he was travelling for business for 2 weeks, and even though he was away, he and I were inseparable (virtually). We met, he treated me fairly poorly, I was rejected by him. Dismissed, out of hand. It hurt. So I rolled up my sleeves and kicked the dating profiles into shape. I was kind of swamped, had about half a dozen emailing me, some calling, texting etc. I stopped sleeping; I felt sick, and stressed. When stressed, the abusive past means that I revert to fearful, so I spent my waking hours in a state of unwarranted fear, and my nights tossing and turning.
What I realised was that i was not happy with what I was doing, that the need for attention to spite the rejection of the one guy was harming me more than the original pain itself did in the first place!
Your feelings here are your instincts telling you to slow down, to care for yourself first.
I excused myself from all of them pretty much. One emails me on and off, the other looks to be turning into a proper GF/BF thing... so Mr Email will have to tail off shortly, I'll have to tell him that there probably won't be any meeting up.
So please, listen to your body. hear what your instincts are telling you.
Focus on you, focus on fighting to get yourself some therapy. I have therapy once a week, and it's really great. I find it invaluable. It's lovely to have a space to sit and talk about myself for an hour, no phones, emails, interruptions.... 