I'm as stunned as the rest. You've had such a profound impact on so many here I think we are feeling a real sense of loss.
It is understandable that your husband would be distressed if you are trading his needs for helping out a bunch of screwed up strangers on the internet. Privacy issues are powerful. However, as others have stated, you should be allowed to have some hobbies (whatever the f you want--not just spouse sanctioned hobbies) and friends (even if they are anonymous oddball characters). A compromise is in order here but sometimes compromises are only one sided. It seems that you're the one who has given him everything he's asked for. Great for him and likely you'll be sainted for it, but not exactly healthy for you. If my wife was giving me as much love and sex as you're giving your hub I wouldn't care what she did with the rest of her time. As it is she does pretty much whatever she wants and I support her and I ain't getting any sex.
In any case, I won't preach anymore. We are very sad to get your resignation. Things won't be the same. I fear we may all regress into a whining bunch of crybabies, stewing in our confusion. You certainly kicked a few asssses into gear with your tough love suggestions and heartfelt words.
But don't come back for us (even though we need you!), come back for you--if you decide to. Do what's best for you. I suspect that you're the type of person that gets pumped up by helping other people, quite a virtue to enjoy.