Your question seems very straight forward-but your reaction to his ED is obviously painful and life altering. I can tell you that his ED is not related to a reaction, or failed reaction to you, and tell you that ED often comes with varying responses to available stimuli (acheiving erections with certain stimuli-but not others). While this is true, it is much easier to say than it is to cope with on a daily basis. First, I would encourage you to find support involving others coping with ED from your perspective. This may be easier in a local support group or online forum, but will hopefully allow you to gain insight into your role, or lack of role, in his problem, in addition to providing the better suggestions for treatment and intimacy options. The following sites offer information in addition to support referrals/blogs/message boards etc.
http://www.sda.uk.net/
http://www.healthcentral.com/erectile-dysfunction/
http://www.issm.info/prod/system/main/index.asp?page=/prod/data/issir/edbook/index.asp
http://www.healthcentral.com/erectile-dysfunction/websites.html
Your frustration is understandable, though each of you coping seperately with this issue may be leading to further estrangement. Seeing a couple's therapist may be critical in preserving your partnership, find one using the website referrals mentioned above, or talk to his Doctor for a referral.
I hope my information is helpful. If you have more questions, just ask! I will gladly help, otherwise please click "accept".
Positive feedback and any bonus would be appreciated. Thank you, Christy