Is eating out a turn off for him?

So me and my bf have been dating for a while and recently became very sexually active. I love it BUT there is one small problem.. My boyfriend doesn't even last a minute before he ejaculates and I never get to reach my climax. To help solve this problem, our foreplay got a little more intense and I started hinting him to go down on me. The first time he went down on me didn't last long then we had "the real deal" sex. Fast forward a few weeks and intercourses later, I motioned him to go down on me again and this time it last so long and It was amazing and I even climaxed. Only one problem.. My boyfriend hovered over me, kissing me, and as I was preparing for him to enter me I reached down for his penis and his erection completely dissipated. I was humiliated.  Does eating out turn guys off?