Justin lost faith in tessa
During one point in the movie he said this. That he failed her, because he lost faith in her. But come on wasn't that actually her mistake?
I understood that they actually loved each other very much. But on the other hand she seemed very flirty with other men, and also with Arnold. It is one thing that she wouldn't tell Justin what she was doing, but she could at least reassure him that nothing was happening between her and Arnold for instance, or tell him that Arnold was gay ;) Do you agree that it was her own fault that Justin lost faith in her?