Teen love is really the only one that can be a "Forever" girl. Yall know each other as kids and grow into love as teens, get married right out of high school and set off unto the world a team. RIDE OR DIE.

Never have to fight with her.
Discuss disagreements and she trusts your choice.
Appreciative of your strengths and understands your flaws.

There really isn't anything quite like it. Just try to establish a relationship on principles like Communication, honesty and consistency. No topic is off limits for conversation and embarrassment is not possible because judgment is not coming. Your a team, you are one.