Offended

Last night I went over to talk with Mark about the comment I made and why I got so upset over it.
There was a lot of talking on his part, but as in all arguments I never know what to say and when, so I let him go with it.
He was rather offended that I would think that he would ever cheat on me because I wouldnt have sex with him. He thought it was completely outrageous that I came to that conclusion without even thinking about who he was as a person. He then moved on to comparing me to his ex. Saying that she hadn't an ounce of empathy in her body, while it was a main part of who I am. He also said that I couldn't possibly make him unhappy unless I was unhappy, thus far in the relationship anyways, and that all his ex did was make him unhappy and feel trapped. That was the main reason he cheated on her, because he wanted out and he'd mentioned to her countless times that he wanted out and she'd just wave them off and pretend nothing had happened. He'd said that he knew it wasnt the right thing to do and he could tell that he'd hurt her by doing it, and he felt awful and like when he did it he'd broken his own heart instead of her doing it for him
He said that even though she was awful, he loved her. And somewhere in his head he always thought that if he loved her enough she would change, so he tried and tried and tried and ended up only hurting himself. He said he'd made a vow to himself that if he was ever that unhappy in a relationship again, no matter what, he would get out of it without resorting to cheating. And he then reminded me that he made a promise to me that he would never cheat, and that I'd never have to worry about it.
He mentioned a lot of other things, like the fact that if we ever lived together he wouldn't want to cheat just because I wouldnt have sex with him everyday, he knew it wasn't in me to put out every day anyways, and that if it was going to make me unhappy he didnt want to even risk it. he said that it would be vain and shallow of him to cheat on me for that. Or even at all. He said that he wouldnt do it not only because of the promises he made but because it would hurt me, and he didnt want to do anything to upset me.
Lastly he said that we both owed each other an apology, me for shutting him out and reacting the way I did, and him because he didnt think the comment he made would be taken so literally on my part.
All in all, he said the right things. And he's not going anywhere.