Can u love only 1 person in ur whole life?

I am a very loyal person when it comes to love. But to love someone for the whole life is a bit difficult to do. It depends on how you look at it. Like me, I am married now. I love my husband all out. Nothing can change that. Eventhough life is not a bed of roses, I still believe that he is the one and the only one I want to be with for the rest of my life. I feel guilty if I try to betray him, though he might not know about it. I will never do that kind of thing to him. For me, if you could find your true love, definitely it won't be that difficult for you to love one person in your whole life!