It is a mystery why we fall in love. It is a mystery how it happens. It is a mystery when it comes. It is a mystery why some love grows and it is a mystery why some love fails.
You can analyze the mystery and look for reasons and causes, but you will never do anymore than take the life out of the experience. Just as life itself is more than the sum of the bones and muscles and electrical impulses in the body, love is more than the sum of interests and attractions and commonalities that two people share. And just as life is a gift that comes and goes in its own time, so too, the coming of love must be taken as an unfathomable gift that cannot be questioned in its ways.
Sometimes, hopefully at least once in your life - the gift of love will come to you in full flower and you will take hold of it and celebrate it in all inexpressible beauty. This is the dream we all share. More often, it will come and take hold of you, celebrate you for a brief moment, then move on.
When this happens to young people, they do often to try to grasp the love and hold it to them, refusing to see that
it is a gift that is freely given and a gift that just as freely, moves away. When they fall out of love, or the person they love feels the spirit of love leaving, they try desperately to reclaim the love that is lost rather than accepting the gift for what it was, then moving on.
They want answers where there are no answers. They want to know what is wrong with them that make the other person no longer love them, or they try to get their lover to change, thinking that if some small things were different, love would bloom again. They blame their circumstances and say that if they go far away and start a new life together, their love will grow.
They try to give meaning to what has happened.
But there is no meaning beyond the love itself, and until they accept its own mysterious ways; they live in a sea of misery.
You need to know this about love, and to accept it. You need to treat what it brings you with kindness.
If you find yourself in love with someone who doesn't love you, be gentle with yourself. There is nothing wrong with you. Love just didn't choose to rest in the other person's heart. If you find someone else in love with you and you don't love him/her, feel honored that love came and called at your door, but refuse the gift that you cannot return. Do not take advantage; do not cause pain. How you deal with love is how you deal with you, and all our hearts feel the same pains and joys, even if our lives are different.
If you fall in love with another, and he falls in love with you, then love chooses to leave, do not try to reclaim or to assess blame. Let it go. There is a reason and there is a meaning. You will know in time.
Remember that you don't choose love. Love chooses you. All you can do is accept it for all its mystery when it comes to your life. Feel the way it fills you to overflowing, then reach out and give it away. Give it back to the person who brought it alive in you. Give it to others who deem it poor in spirit. Give it to the world around you in any way you can.
This is where many lovers go wrong. Having been so long without love, they understand love only as a need. They see their hearts as empty places that will be filled by love, and they begin to look at love as something that flows to them rather than from them.
The first blush of new love is filled to overflowing, but as their love cools, they revert to seeing their love as a need.
They cease to be someone who generates love and instead become someone who seeks love. They forget that
the secret of love is that it is a gift, and that it can be made to grow only by giving it away. Remember this, and keep it in your heart.
Love has its own time, its own reasons, and its own coming and going. You cannot bribe or coerce it, or reason it into staying. You can only embrace it when it arrives and give it away when it comes to you. But if it chooses to leave from your heart or from the heart of your lover, there is nothing you can do and there is nothing you should do.
Love has always been and always will be a mystery. Be glad that it came for a moment in your life. If you keep your heart open, it will come again... 
