I never said you couldn't love more than one people in your life. What I never got about LP is how they fell in love with other people and loved them WHILE they supposedly still were in love with each other. Don't you people say they have always been in love with each other throughout the entire series? That's what I thinks is impossible to happen. Once you truly love someone, you just don't fall in love with someone else.
How is that impossible or hard to understand? You don't think people can be in love with two people at once? It happens every day and there are so many people in real life who are in love with more than just one person. Just because you truly love someone doesn't mean you can't fall in love with someone else especially if you end a relationship and try to move on. Which is exactly what Lucas did. He was in love with Peyton but their relationship wasn't working out for him and he eventually fell in love with Lindsey, too. Not that far-fetched.
And yes, people do have rebounds but I think it was crystal clear none of them were, especially Jake and Lindsey, who were people LP proposed to. You don't marry rebounds, you sleep with them. Which means you have no feelings for that person. But LP both had feelings for Jake, Lindsey, Julian and Brooke.
Okay, I'm going to disagree with this. I think it was crystal clear that Lindsey was Lucas' rebound. He only accepted her date because he thought Peyton didn't show up to his book signing. Had he seen Peyton there, he and Lindsey would've never started a relationship. Yes, he proposed to Lindsey AFTER she found the ring and was about to walk out on him; it wasn't like Lucas truly wanted to propose to her until Lindsey reassured him and said everything he wanted to hear. Having someone as a rebound doesn't mean that you can't eventually develop feelings for them or fall in love with them. It's the simple fact that they were initially used as a distraction which is exactly what Lucas did to Lindsey and Peyton did to Julian.
One thing I will agree with you about is how Jake was never Peyton's rebound but I can't say the same for Julian.