It could be a marriage proposal or a moment of closeness and trust in a simple gesture. You're not alone, you're facing the world with someone else. You are together. There's a certain exchange of energy, a strong connection between two people. Intimate and a little flirty, yet reassuring.
The ‘ring finger’ is not the same in all countries and cultures. In many Western countries, It is believed that the tradition of a ring on the fourth finger on the left hand originated because this finger has a vein that runs directly to the heart.
A sign of wanting to be close to you and with you. Protective and affectionate. Will you be mine?