That's the unfortunate part of having a relationship with a man that much younger than you. I'm 25, and although I am lucky enough to have found a guy my age that is not commitment-phobic, many of my friends haven't. In fact, the ones who are married or engaged are so with men in their 30's. You are expecting a LOT from a guy his age, honestly, which makes it even tougher for you since I'm sure the 'ole biological clock is ticking. Let's be honest here.....he's 26, still living at home with mommy, and is balking at conversations of commitment after 1.5 years of dating? I think you are expecting too much from him. Either wait a few years til he grows up, or go find a guy closer to your own age who is where you're at in life and wants the same things. Him having an IQ of 160 might make him smart, but certainly not mature.