For goodness' sake, you have instinct enough to ask people in a public forum- have you asked him?? If you HAVE, you obviously don't entirely trust your instincts: mainly for the reasons outlined above. Find your self respect, go with your instincts and leave him to it... he'll probably marry into kind and find another girl for extracurricular that he can fob off with the same guff.
YOU, on the other hand, could be out loving life and erm, yourself- which would be a good start, no? Sorry if I sound harsh:(