I’m lesbian and in a 1 year relationship. A few times in my relationship Ive brought up the idea of a threesome and my girlfriend was kind of iffy about it. But the other day after sex, she was saying how she would be down for it and she was excited. I finally found someone that we would both be comfortable with and would also be down and she said yes and seemed so excited and then started a fight with me over it shortly after. I literally cannot get the idea of a threesome out of my head. How do I get over that want and/or get her more comfortable with the idea of it??