Mentioning love we often remind romantic relationships, weddings and "lived happily and died together on the same day". Nobody can oppose but life is longer than such kind of love. Love does not always lead to marriage, marriage is not always for lifetime. Life is more than romantic love.
In such case what does "love of my life" mean? Is it something like a rose unicorn? Everybody heard, nobody saw?
Love of my life is my child. It is not love from the first sight, believe me. In the beginning it is responsibility only. First you should give birth, than take care, than teach what life is. And protect your child from the cruel world. You should protect cruel world from your child as well)
But when you see personality, when you see the soul in her eyes love covers you as strait jacket. You will never get out of it, you will defend and appreciate it as long as you are alive.
Everything that is left is always follow your love. No matter if it is one, two or five. When you see their soul in their eyes you always give them yours.
P.S. Described above is my personal experience. If yours is different you are ok. All of us are different and should not feel the same.