My boyfriend invited his best friend to dinner and poured out my shortcomings.

It seems that this matter left a knot in his heart. Maybe he wants to use his best friend to test your feelings for him, or maybe he thinks your best friend is a friend worth making.

Instead of wasting time guessing here, ask him what he really thinks. Good communication is a way to enhance feelings. A blind guess will only sour your feelings and make you go further and further.