I know, and he'll ask me sometimes why I don't trust him at times, but he hates if I bring up the past. I know that if I had a history of cheating on ex's then he'd have a hard time trusting me too. Actually, I have no history of that, and he still doesn't trust me much. He won't admit to his extreme insecurities either.
But like I said, we just had a really good summer together, and I really think it helped strengthen our bond and our trust in each other. Well, I had thought that, except for the tantrum he had for the first few days of me being here because I spent much of the time talking to my new roommate, because he was the only one home (now living with 2 guys and a girl). He flipped over me being less than responsive during a two hour frame where I wasn't texting him back that much because I have having a discussion. Then he had that audacity to ask me the next day if I cheated on him. If he was here in person I would have kicked his stupid ass myself.

I was so pissed off at him to have the nerve to ask such a thing from me the day after I move into a new home. He knows I'm not that kind of person. And mind you, the roommate I was talking to is about 40. Grrrr. Gets me worked up just thinking about it.
I think the main problem is just the arguments. Like that stupid petty one I just mentioned. Those are what make things worse between us.