Just give as if it were a river flowing from the depths of your soul. Love the unloved and you will be filled with the power of love and compassion in your own soul. Make love to those who love you and understand what the truth of love really means. Do not limit the dance of the heart. To say something is mine or not mine, is to make that tree in the forest your possession instead of part of yourself.
Love is too special to make any hard and fast claims on it.
Such things diminish love. If you open your heart to loving more than one person, giving to more than one person, sharing with more than one person, you open your heart to include everything you are as well. It is a door which opens both ways, and if it does not, then move on, find the next trail in the forest, and send best wishes and kind thoughts to those who are still on the learning path. Not everyone has the courage to live, and everyone has their own lessons waiting to teach them what you already know. Their time will come, just as yours did.