If you don't have a sense of purpose in life, it can be a big problem when you get into a relationship. If you meet an interesting woman with lots of projects and purpose in her life, it's great if you have your own thing going on, too. Women find it attractive when men care about something and dedicate time to it. It could be a career you're developing, a hobby you're passionate about, or even some volunteer work that means a lot to you.
Sometimes a purpose doesn't even have to be something you choose. For example, you may spend a lot of time caring for an elderly relative or tend to other members of your family. All of the above are admirable traits. If you don't have a purpose, it usually indicates that you're looking to your partner for answers, which often turns women off.