There are a lot of things that change for me. I think the biggest things are:
1. Making sure I maintain a separate identity apart from whoever I'm in a relationship with i.e. Don't lose myself. This includes keeping in contact with friends, having hobbies that I don't stray from and not being afraid to do things for myself once in awhile.
2. Having established boundaries to ensure that I don't allow myself to be treated with disrespect or allow my wants/needs to become ignored. This also includes boundaries with how others treat my partner/kids/me. I've been a conflict avoider in the past and have often failed to call out BS from friends and family toward my wife or kids. I will stick up for what I know is right and not stray from that with all things in life.
3. Understanding that relationships take work and a partners commitment to me should not be taken for granted. Make time for that person, including spending time together, communication and learning through books/IC's/etc how to deal with the different problems that will occur in relationships.
There are many other things I've learned, but if I can focus on these things, I think I'll have a much better chance for success no matter who the lucky lady is.
