100 Light Years From Home - S5-E19
Corrected entry: When Joey and Pacey are talking while walking on the beach, Pacey makes a point of telling Joey that Dawson is her past, present and future. But later, when Dawson arrives and asks to see Joey-Pacey suddenly becomes very negative and tells Dawson that he should give up on any relationship with Joey because "it's over". This doesn't make sense for Pacey to contradict himself so strongly, and it was rude and hurtful for him to tell Dawson that. Especially when earlier in the Season during the funeral episode, Pacey told Joey that 'he was all for those two (her and Dawson) having their shot'.
Correction: That's just your opinion, not a mistake.