Knowing I have a partner in life who seeks the same goals and aspirations. The best relationships are those where you each have your own goals and aspirations but you combine them into a life with each other.
Being able to be comfortable with eachother. I realize that's why some relationships don't work out. The last one I was in, a couple of months ago, was pretty difficult because we had feelings for eachother but weren't comfortable around eachother at all. Sometimes it's not a good idea to date your year long hallway crush..