He wants me to be psycho??

My bf said I’m “too nice” and he’d like to see my psycho side sometimes. Like he purposely tries to piss me off to bring it out of me. The other day he said he thinks he wants an open relationship just so he can be with other women sexually, but he would only love me (he was just trying to make me mad, didn’t mean it at all). At first, I was mad af but I didn’t let it show. The next day I told him that he pissed me off and if he wants to throw his dick around for other girls, I’m gone. He just laughed and said he expected me to flip out and be like “fuck you” or something. I’ve gotten to the point where I’m completely unbothered so shit doesn’t work me up easily. I guess I’m not like most girls, but I’m more peaceful this way. Is this a bad thing??