ITH - I agree H is being completly unfair in this situation. He is being a DAM and you need to get his emails out of your head. He is taking you on one giant guilt trip and you are going along for the ride. Please don't get upset by me saying this but if he was thinking logically...he claims he needs to be alone,right? If that was really true than him coming up with the payment for school would not be your responsibility at all. He would have to figure that out on his own all together. So he wants the benefits of being married in the financial aspect yet he does not want the real pressure of the marriage itself. So if you think about it with that logic then you need not worry because he does not want out of the marriage.
All that being said....focus on YOU right now. Do things to get this out of your head for the time being or else you are going to drive yourself crazy!! Hang in there.
