Father Manglano: Starting with Spinoza, philosophy has proposed a subjective love: Love will be a passion that awakens my happiness because of my relationship with a person with whom there is chemistry, as we tend to say.
Love will come as a sensation that I find in myself. Then, what I love when I say that I love is nothing distinct from myself. In that way, things, love lasts only as long as the sensation lasts. The moment the sensation disappears, or I wake up as a different person, that first love will have died, and on and on. Love understood in this way is necessarily ephemeral.
Nevertheless, other philosophies understand love as something objective: It is the free exercise of loving another person, of uniting myself to him or her.
The "you" is not an opportunity to feel like I'm in love, but rather the "you" is the motive for which I come out of myself to base myself on another vital center, which is the person of the beloved.
Love is "in relation to": I come out of myself and go toward the one who gives to me. Then yes, it is possible to accomplish an eternal love, that is, after all, what all of us would like.
I make an argument similar to this in the closing chapters of Love and Economics