I generally agree with a few opinions here.
An ideal love exists, the love of Jesus Christ - HECK YEAH!
If you're talking about an ideal human love, then no. We're not perfect, and therefore cannot love perfectly, but I believe that by the grace of God we can get darn close to "perfect, as our heavenly Father is perfect." So, I think a near ideal human love exists.
Does God design one person to be with one other specific person so that things just work out? No. It's impossible for Him to do that and maintain the free will of humans. I believe that God "okays" and "declines" certain choices, but I believe that depends on what stage, location, profession, etc. we are at in life at the specific time.
Obviously we can love our wives and husbands an immeasurable amount if we know the love of Christ, but also, we can love EVERYONE an immeasurable amount if we know the love of Christ. Therefore, essentially any two followers of Christ have potential to love eachother an extensive amount. It doesn't mean they were designed to be from birth or anything.
Just because a fated true love does not exist does not mean that the beauty of that sort of relationship is tainted. A marriage is a valuable, precious, powerful, special, admirable, gorgeous, and astounding relationship. It's every bit as meaningful.