The romantic love we feel toward the opposite sex is probably one extra help from God to bring you together, but that's it. All the rest of it, the true love, is the test.

This quote is saying that the initial interest in finding a romantic partner (love at first sight) is a special gift from God. This “romantic love” makes us attracted to the opposite sex and helps us come together. But the real test of true love is what happens after the initial attraction. It requires work, patience, and a genuine interest in getting to know the other person, and making their relationship stronger. This “true love” is what really matters.