How do I control my jealousy, and at that, my anger?

They say a sound soul dwells within a sound mind, and a sound body. I'm quite insecure with my body. I'm constantly at the epicenter of murderous rage because I find my girlfriend staring off at dudes with blatantly obvious muscles, and it won't stop eating away at me. Sometimes I just want to claw her eyes out and it's, quite frankly, disturbing. I lie awake far into the hours of the night, ebbing away at my mind and wallowing of fear: fear of what I might do to her, or the boys she ogles. I've found the right answers and their effects work quite well, but I don't know how to feel their effects permanently. Please, help me save my soul.