You lost me

I feel like a fool. That I can believe someone to be a better more honest person than they have ever proved themselves to ever be. How did i ever become such a weak and naive girl. I mean really after all that with down you still talk to her and try to meet up with her behind my back instead of being honest about. Time and time i told him simply all it takes is honest and everything else can be worked out. i sincerely believe that but now i feel like a bomb has been blown up in my heart.