Going Perfect

I've been in many relationships before.. but this one is so much more than anything I have ever been in.I'm a gay father, I had my kid when i was 21, and I'm used to relationships where the person says he is "alright" with kids but never lives up to his words. but this guy is different in a lot of ways. For the first time in my life, I'm looking at the future where we might be together. So, I have a question for those who are in a serious relationship when did you ask your SO to move in, or when did you move it? Did it change your relationship, and how?Thanks!