Which one is better/more important: To want someone or to need someone?
Let’s start out with need. When you need someone, you feel like you can’t live on without them. In a very cliched way, your heart aches and you feel like you’re “a fish out of water” without them. This could be obsession (which is never healthy). Needing someone could feel like having them and never wanting them to let go. You could very well attack them for wanting to leave, because you selfishly want them in your life. Needing someone, however, can very well preserve relationships. Even if you don’t feel the initial love you might have, you may have that sense of duty (an emotional one) as well as look past the —. You might need someone in your life, and thus, give them all the love you can possibly offer.
Now, with wanting someone, you don’t have a need but you do choose to be with them. Even if your need was gone, you remain with them because that’s exactly what you want. This sometimes blends with “need” when the person you’re with might not be perfect, but you want to be with them anyway. It’s different when other people like you/you could be with others, but you still choose to be with that one person. It could be seen as more meaningful. However, it can still leave you feeling empty when you know that there’s nothing really keeping you two together. They could very well leave at their choosing, and you don’t have as many ties linked to a sort of responsibility in respects to each other.