Had two serious relationships lasting 3 years, both woman knew what was up (my ED), because I was open and told them. First girl was working in medical field and we were researching my ED together, did loads of experimentation and final solution for my ED was viagra 100mg + tight novelty cockring, this combo works fairly ok for me.
I ended both relationships due to not wanting serious commitment (children and marriage).
Also, there is more to a man than a dick and there is more to sex than hard dick. Girls just want to be loved, refocus your game to pleasing woman in different ways (emotional, tongue, fingers, strapons, vibrators etc)
And final thought, you will need to optimize some things, find ED remedies that work reasonably well, if nothing works do implant. Look for type of girl that would more than likely accept your condition (virgins, filippino girls, girl that doesn't want sex all the time, asexual woman, girls that can't cum without external stimulation, friends with benefits, sugarbabies etc). You can even go monk mode and outsource emotional attachment to friends instead of your partner.
Btw I had ed since I was 15, noone knows what's up (or not in my case
) now I am 33, have casual relationships and when I get asked about what is that thing I put on (cockring) I just say "stfu spread your legs!" or "invisible condom". Live your best life man!