Only BJ's .. never sex

why is it that ever since I got engaged, my fiancé only wants blowjobs. 
I start with foreplay and then when I  think I can make a move into sex, he says I tricked him by making him think he was getting only a blowjob, then proceeds to refuse sex..
I told him it makes me feel inadequate..
yet he can't stop thinking about only oral sex.. for himself.