For a Gemini, relationships are really important. You need a second person, a cosmic twin, to help you feel balanced.
You also need someone to communicate with, and share all the exciting details of your day. Gemini is famously indecisive. In love matters, you may find that it's too difficult to choose one person to spend the rest of your life with.
This person would have to be very special indeed to capture your heart, and hold onto it for eternity.
If you want to settle down with someone but feel yourself getting restless, try to make each day fresh and new by incorporating some new little gesture, activity, or even just appreciating the moments together so nothing gets stale between you.