Love feels so good because the existential depths of alone, that follow us through every moment of our lives, is a place of such sorrow. And yet, love wouldn't feel so good if the sorrow wasn't so deep. We need that sorrow for love to take hold.
And yet more, when we truly let love in, let it take that hold, the inevitability is that that love will leave, either because we or they will die, and all that love will become grief, and with that grief, sorrow again.
Grief and love are a package deal, one we would be fools to pass over during what might be our only opportunity at this life, for along with all that sorrow of grief is the joy of love. We will have sorrow no matter what, and as strong as the sorrows that comes in the stark tension between once-together-in-love and alone, at least that sorrow had the joys of love in tow.