I feel as if Lucas in season 5, seemed very mysterious as well as (I don't know, can't really describe it but) lost? And confused. He's not the same since season 1-4 were he was so happy. He's always torn between two lovers and both times Peyton is involved. And I think he and Peyton should be together, because whenever they are everybody seems to be happy. I mean look season 4, near the end Naley - their love was stronger than ever, Brooke and chase were ok together and everybody's life was snapped back in focus. Even I if like Lindsay, I still think Peyton is the one. Because if he was in love with Lindsay he would of smiled more often, because when he was with Peyton (season 4) he never stopped smiling, and he never looked at Brooke the way he looks at Peyton (season 5). Lucas's heart is just conflicted, the same way as Karen was with Andy and Keith.
Now season 6 has approached let see how the Lucas character takes a new dimension.