I think what ummmm has said is very true. The mature thing is being able to recognise that however much you enjoy being together, both parties in a relationship still need a little bit of space where they can be an individual in their own right, rather than being part of a couple. This may include the freedom to participate in a hobby of some kind which perhaps your partner doesn't like or enjoy, and being allowed the freedom to do this, knowing that neither of you will abuse the trust which exists between you.