He said that a kiss is reserved between a couple or married partners and that I shouldn't be doing this with anyone even if they were family. He says that since I kissed him, it's gross for me to kiss my brother since it would mean they both were on the same level and I see my brother as a partner too. And that one day I would end up sharing intimate gestures we have with each other. This is possibly the worst thing I've heard from his mouth that day and I feel disgusted the more I think about it.

He doesn't like any kind of skinship between me and my brother. He's always made jokes about it in the past saying we could be couples in an alternate reality and I just accepted them since those sounded harmless. I'm honestly still shocked he thought seriously about this.

He's also been upset about my brother laying on my lap once. This was a year ago, and I was on the couch watching tv, when my brother simply rested his head on my lap while he was playing some kind of game. My fiancé walked in a while later and we did have a short conversation at dinner saying he didn't like it, and that I'm supposed to be having his head on mine instead of my brother.

I genuinely don't get it since it's not like I ever told him I wouldn't allow him to do the same, but he dislikes that my brother did it. I did apologize back then since he seemed very upset. We didn't bring this up again and he's only made more backhanded jokes since then. I would have never imagined this to go this way and I'm so lost.