"Why do men not talk about ED?"
Well hummmmm first thought is, if she has not noticed before now, has she really not noticed me at all ?
This type of question should be discussed between the couples involved. I mean really, we don't have the answer, since there are so many answers for this question. It could be medical or mental, or a combination of both. First discuss the problem with your partner. Stress a medical check up. After health is determined not to be the issue, seek a mental health professional. If he refused to discuss any aspect of this issue(even from the beginning! YOUR WORK IS DONE.! Then you, yourself, will have to make the decision on what to do next....simple.
Do you love him?
Is the relationship worth trying to save?
Could there be another women?
We cannot help with those answers either. I comes down to what is the relationship worth to you. Are you ready to fight or fly? I have known some couples that adore each other. And have found ways to continue their private life. I have also known a few women that would rather have a cuddle if nothing else is available. You see, sex is just sex, but love is the glue that binds us together.