Ok, going out on a limb here and hope I don't come off as too judgmental - have you apologized to him about revealing his medical issues and acknowledged the breaking of trust and confidence? ED is a very personal and private thing for most guys and can be tied to how they see themselves as a man. If he already had some issues with not being self confident in feeling like a man, losing his ability to perform may have made him feel very emasculated. And while you may have been looking for support from a friend and to vent some frustrations, he may have seen it as being criticize, teased, and belittled.

Yes, I see groveling as well as requesting that you see marriage support or whatever he feels he needs to help rebuild that trust. And perhaps inquiring more about his needs that are not getting met, why won't he be coming back? Beyond this one instance, what else is he battling within himself?

Again, I hope you do not see this as being overly judgmental as I am sure there is much more to the story than your brief outline.