Why do I feel like the villian?

Why do I feel so bad when Miles gets into trouble? He's sitting in his room crying his eyes out for something that he did wrong and I feel horrible. He's totally rationalizing how this is all my fault -it's crazy. But somehow I feel awful sitting out here on the couch listening to him begging for me to come in and talk to him. I know that I can't because then he wins. We go through this every now and then. Things blow up over something so tiny. He wanted another juice...we thought it was too late...we said no and he tried to take it anyway. He is so willful and tries to get his way and doesn't listen and then things just blow up. He gets so angry and then somehow I feel like the bad parent. Why? Because I put my foot down and now he's sitting in his room screaming his lungs out wanting me to come back there and talk to him. He knows he's in trouble because he's not coming to me. I hate feeling like the bad mother, but I actually think I am being the good mother...maybe.

Oooh..I just got an apology.