Oh, I would have thought Love is somthing that can exist within oneself without he object of that love being a physical reality, or another entity capable of feeling love in return.
Just because the god turns out to be unreal dosn't cancel out the devotion or whatever a person felt and expressed and acted out while they beleived in that God.
Maybe it was a Love of less practical usefulness that a love of a real entity (of a lover, or your parents or whoever), but it was real while it lasted, I wouldn't devalue that experience in anyway.
Just becuse the object of our affection/devotion proves to be not to our expectation dosn't mean we didn't honour them with our love and experience that as a real thing - I think it'd be a waste of a precious thing if we wrote off good things as a result of disapointment.
There aren't many good things in the world, why write off the goodness in what we experience, even if all our hopes aren't fulfilled?
I say, enjoy the love of god that was experienced, place it high, and move on in seeking out more goodness to love freely, without inhabition, without regret and without second-guessing what was given freely and with joy for a benifit that might have now passed.