Okay so my mom and dad met through their best friends who I will call Jared and Riley (who are a couple). Riley and my mom has been best friends since college and Jared and my dad have been best friends for just as long. Anyway six months after I was born, Riley and Jared had a boy (I'm a girl) who we'll call Bob. Bob and I were literally raised together and he's like my brother. His girlfriend and him have been together for 2 years. Three weeks ago he told me that he's trying to have a baby which I was really excited about because I just had a baby and since we were raised so close together I wanted to raise our kids close together too. when I got excited I told him I couldn't wait to see his girlfriend so we could talk about baby clothes and if she needed anything if it was a boy like I had I could give her clothes etc and he said "no she's not trying to have a baby I am." so he's trying to get her pregnant...I love him and he's family but I told him that was wrong and he couldn't do that and he basically said that he didn't really care because they would have kids one day anyways. for the past couple of weeks I've been telling him that he should talk to her about it and whatever and he didn't so I told her and I told her not to let him know I told him and such. She said she wouldn't.

My question is should I have minded my business or let her know?