My partner is mad because I "withheld" information, and I don't know what to do!

So, let me start this out by stating I am diagnosed with low spectrum Autism. If you met me, you'd just think I was awkward. But otherwise, my mom worked really hard to teach me how to act. I know what I am "supposed" to do.
 
But lately I have been having issues with my partner. He knows of my diagnosis and knows I don't fully understand a lot of the social rules and expectations others have. I think he is controlling, and I think he is trying to use information to manipulate and control me.
 
He recently went through my email (which I am FURIOUS about) and found emails sent to an ex boyfriend. We dated for a year, he was in the US for 2-3 weeks and then home in Brazil for 2-3 weeks the entire time. And when he finally left, I sent him an email telling him I was heart broken and in love and so disappointed he had led me on. I wasn't in love, it just hurt he was leaving and I misdiagnosed the feelings! 
 
But my partner is furious because I left this young man off my "how many times have you been in love" list, which I thought was a dumb conversation in the first place! Isn't it MY decision who I count as a "great" love? I loved my high school boyfriend, still do, but I was never IN love with him. 
 
My partner is accusing me of lying to him. I didn't lie. I wasn't in love with my ex and the fact he is so mad about an email I sent TWO years ago to an exboyfriend, I am pissed! 
 
Ugh, just venting I think, but I'm not wrong, right? I didn't lie, and that isn't a question anyone can answer except me. Grumble grumble grumble.