I'm going to have to agree with others and say that it sounds like she's not emotionally involved in the relationship anymore and wants out. Besides you sound unhapppy in it as well. You shouldnt have to worry about your girlfriend around other guys, drunk or sober. You sound like a nice guy and I'm sure theres other girls out there who would gladly be in a relationship with you. I dont know any girls that get angry when the person they love wants to go down on them. Good luck, you deserve better.