Discussing what is fixable in relationships

My boyfriend and I were discussing what would be fixable in a relationship. So I started listing examples such as an argument big or small, not liking a sex act or what a person does in bed. Then it went to the discussion of asking if I kissed a guy would he break up with me?

His response : he’d be mad for about a month then joke around with me about it. He said as long as I didn’t have sex with the guy then the relationship would be fixable.

Me: what if I went out and kissed a girl?

His response: I would not be mad at all. I’d be like cool.

Me: okay? What if I had sex with a girl ?

His response: I’d join in on that.

Me : what if we said you can’t join?

His response: then I’d masturbate while I’m watching.

So from what I’ve gathered it’s wrong if I kiss a guy, but he wouldn’t give a damn if I kiss a girl. I told him it was weird that he wouldn’t be upset about the girl part. I’ve seen so many women on here upset their partners are kissing or doing other things with guys.