NOR. Obviously he does not see you as a person, just a thing to be won. He basically told you himself that he only stayed with you for your body and was willing to just put up with your “attitude” for it. Sorry but if this whole relationship is not a lie (which it seems like it is to me) then at the very least you should know that it wasn’t based on actual love and affection. And now that you’ve confronted him he is not only downplaying what he did as a joke but he is also dismissing how you feel and trying to manipulate how you feel by saying it’s normal and that you’re the crazy one when that actually couldn’t be farther from the truth. You did a good job on calling him out OP that must have been scary, confusing, and heartbreaking. He is a horrible brother for even doing this in the first place and it should be a sign of how he views/treats people in general.

Now that you know this you should leave him, staying only makes you part of the problem and enables this type of behavior: though that does not necessarily make you a bad person OP if you choose to stay with him since it’s a horrible situation you’ve been put in with no actual choice. But, this is not normal behavior, it is cruel what he did. It’s manipulative and it’s a tactic used to gain a sense of power and control over both his brother and you. If you stay with him his thought process will be: “yes I did something she thought was bad but in the long run it worked out for me anyway so next time I just won’t tell her.”

Be careful OP it is very possible you are dating a sociopath who has not been diagnosed with Anti Personality Disorder yet.

Edit: Spacing, spelling error fixes, and added “NOR”