hun, all I will say, is that I agree with Maysie. If he knows this whole thing will upset you, and he still did it - especially if you have 'issues' - then he really isn't thinking about your feelings.
Someone who knows you have boundaries and still pushes them, and then kind of indicates that 'your problems' are what have caused him to act this way - even if it's only in a vague way - sounds kind of manipulative, and wouldn't have any problems lying about what he's been doing. As it's been said, you wouldn't have known about the email unless he hadn't accidentally sent it to you.
That being said, if you've thought hard and want to give him another chance, then all the best and I hope everything works out for you
