The reality is – some women are just happy on their own. They’re not looking for someone to complete them, they’re not dependent on anyone.
Other people, including men, can pick up on that attitude towards life.
However, that same attitude can give the impression you simply don’t need anyone in your life and that’s what eventually leads others to conclude you’re not searching for a partner.
As long as you feel comfortable in your own skin, there’s no problem. On the other hand, if you still want somebody by your side – let them know.