Ok, so your GM knows you're a min-maxer, makes your character a Lycanthrope, then gets upset when you, fully within the rules, take advantage of the situation?
His fault, his problem, his stupidity. I don't see that you have anything to be sorry for. Having said that, as you say, you do need to work with him and keep everyone happy.
The Wolf still lurks inside, coming out to play in your dreams...
Think of it as a form of "disease" similar to Alcoholism. You are never truly cured. That craving, that hunger still lurks in your heart, no matter how you may try to fight it. A staunchly Good character may be horrified and fight hard against it, but a true Neutral character doesn't necessarily have the moral fortitude to overcome that kind of desire.