You've (pointing in general direction of scriver and Ulfarr) sparked what sounds like a good point to be making, though. The idea that there is one, and only one "true love" (I feel sinful saying that) in one's life is really harmful, isn't it?
Because you have this person (P1), who thinks this other person (P2) is their true love (ugh). Then rejection hits, which I would say is very likely, and it's like P1's entire reality shatters in front of them. P1 has all these ideas about P2, and, I get it, it's hard to let go of those ideas, but I think one of the underlying things that causes rejection to be as bad as it is, is that "one true love" concept.
It's a shit idea to be parading around, especially to young minds, and I don't think it's right to perpetuate it because of how harmful it is. There's always other fish in the sea. Even I fell victim to this, and I have to constantly remind myself when thinking about any particular crush: "This is only one of many possible "ones". You'll find someone that likes you back some day.". I still like (deliberate use of "like", not "love"; anti-creepiness routines dictates that "love" must be mutual) them, but I don't expect anything from them. "Strangers don't owe you shit, nor do you owe strangers shit.", that's what I'd teach to children.
Then again, what do I know? I'm Mr.* Has Had No Relationships Ever, so what do I know?
*(I know there's Mx for enbies like me, but I'm not forcing people to learn that.)