I wouldn't say your fallin in love, its only been a week after all. I just think you are thinking of this girl in a serious manner, and you are in a truly happy place so mentally you feel no need to whack the meat! Maybe also it the thrill of getting to know her. I know when I first start a relationship my desire for masterbation goes down the drain. It comes back again, it allways does lol but for the first little while when i'm experiencing a new relationship, I loose the urge to whack my meat!
and ya since I'm single, the last time for me was...last night LOL