Stop with the Alpha male shit. you know why? We are not dogs, are we? but wait......Male....dogs...hmmm
Thats the problem. We are more intelligent than dogs on an intellectual level. It is deeper. It is love and caring for another person not because we want something in return, but because we care about the person. When they hurt, we hurt. It's empathy, caring and love. Now can it become romantic love? It could. I believe it's great to spend your life with your best friend. Who wouldnt want to do that? Would you want to spend your life with someone who isn't your best friend? Many do, sadly enough.
{edit} If I was gay I'd spend my life with my best friend, but I'm not. But I have a male best friend and yes, we are romantically inclined. We started off as best friends until one day he sugested we take it further. I said, OK, let us see how it goes and so it has been 3 years now. Yes, we have some issues as many couples do, but we still and always will be best friends even if we stop seeing each other in a romantic way. It is agreed because why? We are BEST FRIENDS. And more than that is that we care about each other because we know each other deeply even before we became romanticaly involved. I've always thought that if it didn't work out, then I would want him to be happy anyway with someone who would be better suited to him. Why? Because I care about him.