Don't say you love me, and then break my heart

Have you ever been so sad that you just don't want to do anything but write, or type, or cry? Thats how I feel...
The truth is, I love my boyfriend, I really do. But every time I talk to him he breaks my hearts with his comments, or his words. He doesn't realize or mean to hurt me, but some times the consequences of our actions go unnoticed. All I can ever find is saddness. When I'm with him it disappears, when I talk to him it's like it never happened or he never did it. Then he says one small sentence, or makes a comment, and I fall to pieces inside.
One thing about me only I know: my boyfriend breaks my heart every time he opens his mouth.
I did find someone I like, someone else that is. And this person makes me smile, even in my darkest hours. I am very interested in this person, and I find them intriguing.
I do love my boyfriend, and I am going to stick with him until I know what is going to happen between us, but I don't see how he could say he loves me then break my heart. It just doesn't work, and it hurts.
I can remember one time between us, sitting in the backseat of the car, night time, with only streetlights as we passed them as our light. He ran his fingers through my hair, and when i looked in his eyes, he was looking in mine and then at his hand as my hair slid through his fingers. It was in this moment I wanted to freeze everything, because it was the best thing I ever felt. Then he said, "I love you." and I almost cried. It was beautiful for the 5 minutes the he played with my hair then said the magical words that lit my world on fire. I wanted to freeze time and hold onto that moment in my pocket forever.
Now.... the person that I now like. This is confusing. I've never truly seen him, but I have talked to him quite alot. He was introduced to me through a friend. He makes me laugh, and makes me blush, and I always want to come home and talk to him so that he can make my bad day better. I tell him how my boyfriend hurts me, and he soothes me as I cry.
But my boyfriend doesn't understand what he makes me feel. How can I love someone so much, and cry over the way things seem to work out? The deadly comments that kill my heart....The one's he doesn't realize hurt at all?
But I will wait it out, and I will carry on, like I always have. I hurt the ones around me as they see me suffer through, and I hurt the guys around me as they want to show me better. But I will work through my problems, and try to pick back up the pieces of my heart.
Don't tell me you love me, and then break my heart.