Never want to give a BJ again

My gag reflex was getting triggered every 15 seconds, I had tears streaming down my face, I was not enjoying it whatsoever. I was so done with the whole thing that I even relaxed my mouth a little too much and scraped him a tiny bit with my teeth once or twice (oops 😞). Anyway, all I wanted to do was stop but I always feel bad when I start something and stop before he can finish. But with him doing the thrusting, he was controlling the speed and the depth for the most part, and I was so overwhelmed. 

At no point did I tell him I wanted to stop or withdraw consent, so please no bashing him, but as soon as it was over I went into the bathroom and cried a little. I felt so violated. I've given plenty of blowjobs before, and sure they're uncomfortable 99% of the time, but this is the first time that I felt this way. I don't want to put my mouth near his penis again any time soon. This is such a bizarre occurrence. I love my boyfriend to death but damn.