How can you tell if your boyfriend is not the one?

Simple...when you are not happy with him. He doesn't have to be doing anything "wrong"! We all have our definition of happiness and different expectation. If you feel he is not contributing to your happiness, then you have to ask yourself the purpose of your relationship.If you felt he was the one, you probably wont be asking this question! You would feel it in your heart. If you're posing a question in relation to your personally experiencing then I would say you already have your reservations... If you care enough to save the relationship, then communication addressing your concerns you might find very helpful!