I hear you man! I was in the same boat my ex would frequently say you don't respect my opinion. I also would tell her she was wrong for feeling a certain way. I was young and naive and thought I knew everything. Boy was I wrong and lesson learned never to repeat again.
The ironic part is my ex has told me my mom is wrong for feeling the way she does about the D and won't speak to her anymore.
I agree with you that at some point you were going to face this and maybe if you did everything right you could have made it to your 40s.
I truly believe and some point you have a good chance at recon. One of my best friends parents reconnected after 35 years.