Sweet heart its certiantly in no way shape or form your fault whatsoever.
For him to expect you to some how majically be in control of mostly autonomical responses like orgasms without some pretty extensive training is farcical and even then the human body being as it is litterally impossible for some girls to achieve an actual orgasm let alone a quick one.
It sounds to me like his comments are a poorly unenlightened and childishly egotistical (a typically "it must be her fault") attempt to justify his own precieved inadeaquacies and protect his own fragile ego as opposed to taking the time to learn how to help you and he achieve true sexual and relational fufiliment together.
Why isnt he here seeking information on how to help his submissive and himself mutually?
I speak from personal experience here sis, when I say I have seen only two types of dominants ( and arguabley one kind isnt really worthy of jack crap in my opiniun)
The first kind missess the forest for the trees and thinks he shouldnt have to lift a finger and that he should be served like a god without reservation nothing is his fualt and he only wants a doormat. (personally i wouldnt pee on one of these types if they were on fire)
The other type is the "loving dominant" who may be hard and stern when nessesary but truelly understands it takes two to tango and will do everything he is aware of to willfully seek out everything and anything to better the relationship in every way he possibly can, he may even blame himself more than his partner when problems arise.
Reformation is sometimes possible with the self centered dominant. Once he becomes aware of his problem.
My best advice to you my sister is this, reject the former and seek the later.
....and for all the dominants out there reading this, I have a question (and yes i hope your own dom sees this post someday my sister i would gladely say it to his face myself):
Which type of dominant are you?