Between Order and Randomness

S2 E12: Nathan confesses his past relationship with Taylor (recurring guest star Lindsey McKeon) to Haley, but Haley continues to keep her e-mails with Chris (recurring guest star Tyler Hilton, not appearing) a secret. Lucas and Karen remain at odds over his refusal to take a heart test. Meanwhile, Keith surprises Jules (recurring guest star Maria Menounos) with a proposal, and Brooke fights for better working conditions at her new job.