In a healthy relationship, each partner works at helping the other person grow. While spending time together, doing fun things together, and having common goals are all fine, you should also be able to take up your own interests and hobbies.
A great romantic partner is someone you can count on without having to worry. You know they are going to be there for you when you need it. You know they are going to stand behind you when you need support, beside you when you need a teammate, and in front of you when you need protection.