I have a great idea of how you can help him and help yourself too. There is no more powerful a tool to break free from these things like "accountability". It is the hiding and secrecy which makes it so hard to recover, always thinking that no one knows anyway. If you can convince him to be your partner, being that you are struggling too, and tell him that "we both know deep down that we need to stop, but we also both know how powerful the Yetzer is and how hard it is", then maybe he'll agree. Tell him you NEED him to help you, and he NEEDS you too. Here's what you can do to make this work:
1) Commit to each other full secrecy. Tell him that this stays completely between you and him.
2) Commit to tell each other only the FULL truth and nothing but the truth, no matter what. Otherwise it won't work well.
3) Make up a time at least once a week to talk.
This will be a very powerful tool for BOTH of you. And there can be nothing that gives Hashem greater pleasure than when two Jews sincerely come close to him and Mechazek each other in this battle. Also, see the story of
R'Amram Chasid here, and tell it to him too!
If he can read English, send him to our site. I don't know of Hebrew websites, although you can take some great inspiration for him from these Hebrew PDF booklets if you want:
tikunhabrit.com/Books/SCHAR_ONESH_SHEMIRAT_ENAIM-H.pdf tikunhabrit.com/Books/TIKKUN_HABRIT_BERESHIT-H.pdf tikunhabrit.com/Books/ginzay-hamelech.pdf tikunhabrit.com/Books/rashbi-bris2.pdf Also, we are hopefully starting soon a "live" 12-step group in Israel for frum people. I don't know if this is Shayach for him, and I also don't know where, Jerusalem or Bne-Brak... but if it is Shayach, let me know. When I have more details, I'll fill you in.
May Hashem give you both divine strength to overcome the Menuval and give him your hearts!