I just realized why I find the concept of "true love" so appealing.

Romance has nothing to do with it. It's the (spoken or unspoken) assurance that the lovers will never leave each other, because they want to spend the rest of their lives together. It's the security that comes from knowing you have someone in your life who will always love you and never abandon you no matter what, which is something I feel like I've never had.

(Of course, having your entire support system consist of a single individual is a Very Bad Idea, but I'm not sure it's much worse than having no real-world friends and never being emotionally honest with your family members, because you know from experience you can't trust them not to invalidate your feelings...)