Is AUTHOR wrong in the post ? POST : TLDR at the bottom - \*\*Graphic sexual content warning\*

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John and I met online 6 months ago and met in person 5 weeks after that - we took things slow, didnt kiss for the first month etc at his insistence. I am a very touch orientated person and he wouldnt even hold hands or hug until that point either. 

We first tried to have sex after 10 weeks together and he couldnt maintain an erection - we have had the same issue ever since and have yet to have sex to completion despite trying at least once a week. He has ED and has done for around 3 years even though we are both in our late 20s. Everything is passionate and hot and amazing until it comes to penetration where it just doesnt seem to work. 

I expressed to him a couple of times the concern that he wasnt attracted to me and that at least part of the issue was with me. He always said no to this. I am not his normal type, he usually goes for smaller more quiet women, I am 250lbs ish and have a giant personality to match, men have often said that I'm intimidating - in my career I have to be a total ballbuster as im a younger woman managing a very large team of men that are all older than me. I never specifically mentioned my weight as the reason why i thought he wasnt attracted to me but I absolutely thought it. I have made awesome progress and am actually 100lbs down from where i was this time last year so it is going in the right direction. 

We tried to have sex again 2 nights ago and he was getting frustrated repeatedly trying to penetrate me with a flaccid penis.  After 6 tries I said enough was enough and asked him to stop and for us just to cuddle up. We cuddled and made out and then he said - somewhere in the back of my mind im scared that im not attracted to you due to your weight - since that moment I have been questioning our entire relationship - he has apologised and said he only said it because he wanted to deflect the blame onto me in that moment rather than it being because he isnt a man he isnt able to perform (he has had this issue with previous partners and this has ended some of his past relationships) 

He keeps saying that he is sorry and that he is attracted to me and that he has been to the doctors and he is having further tests next week with a specialist etc but i still cant unhear what he said no matter how many times he tries to take it back

TLDR - bf could not get an erection and blamed not being attracted to me due to my weight in a moment of frustration - AITA for seriously considering ending the relationship over this?