-Kid Cudi- My friend Nate told me this when I was 17 years old. I thought him sage then, with many truths I chose not to follow. Almost ten years later, I'm finally understanding what it was that he meant.
It's a big decision to let someone be such an important part of your life, make sure that you're willing to fight for them and not just give up when it gets hard (Which it will). Otherwise you don't really care for that person, and you are only thinking about yourself.