There is only one type of love.
We label love as platonic, romantic, familiar, parental, etc. but it's all just love. Love isn't any different if it is between a mother and son or lifelong friends. It's no different between brothers as it is between lovers. Not really.
What does "love" really mean? To hold another's well-being as the same as your own. To help that person be happy, healthy and fulfilled. To want to share the best of you with that person. To help ease the other's burdens. To listen, see, and know the other. Or at least do your damnedest to see, hear and know the other.
So in life we have loves who leave us, die, move away, fall out of touch, disappear. But does the love go away? I've been thinking about these lines from Arcade Fire's song "Afterlife":
Oh when love is gone
Where does it go?
And where do we go?
We may call it something else, but love lives on. We may try to numb it, squash it or hide it. But if it was ever really there; it will persist. It will change. It will take a different form, but be made of the same essence.
So if I love you today, I will always love you. If I loved you before, I still do. And if we someday happen to grow love between us, well that will be here long after we are not.