There are two sorts of relationship: Face-to-face. And back-to-back.
I could be interested in what I can get from you. Then we are back-to-back.
Or I could be interested in you. Then we are face-to-face.
Even if I cared for you because I love the way you are, we are still not face-to-face. Because the-way-you-are is not you.
Even if I cared for you because you are my parent or my child, we are still not truly face-to-face. Because there is more to you than being a parent or a child.
If so, only with the One who knows you before you were formed in your mother’s womb, you at your most essential core, and chooses you there—only with your Creator can you stand truly face-to-face.
Only His love is real, and the love of those who love those who their Creator loves.
I don't understand the last sentence What does the phrase "the love of those who love those who their Creator loves" mean?
If the Creator loves everyone, then everyone is one of "those who[m] their Creator loves".
So those who love those those whom the Creator would be everyone who loves anyone.
Therefore, saying "His love is real, and the love of those who love those who their Creator loves" would mean that the love of anyone who loves anyone is real, since whomever they love is one of those whom their creator loves. In other words, all love is real, which is the opposite of the point that the entire article was making until the last two paragraphs.
There is a person who loves you for what you provide him. That is not the real love.
Real love is someone who loves you because you are loved by G‑d—because you have a spark of G‑d within you and that is the real you.