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If you were not an only child and you then date an only child, there will be some things that strike you right away. I’m with a man now who, like me, has one sibling. We understand each other very well. We know exactly what it’s like to share attention and belongings with another person—we did it our entire childhood. And, since we just have one sibling each, we don’t struggle with any middle-child syndrome stuff, nor are we total selfless martyrs the way the oldest child in a large family can be, nor are we total babies the way the youngest child in a large family can be. Having exactly one sibling is a unique experience that we both understand, and that has shaped us in many of the same ways. Now, having said that, I have dated a couple of only children in the past and it was very clear to me how that affected them as adults and romantic partners. Not necessarily in a good or bad way: it’s just different.
Nothing is private
They didn’t have their siblings to share everything with so they shared everything with their parents. They still do. They talk to their parents often and tell them just about everything. So if you think the things you do and say in your relationship stay between you and your partner, you are mistaken.