Buster
If he is asking for another chance you need to make it clear that it be on your terms. You should also tell the Rav or whomever he listens to if he listens to anyone that is that this will only work and he can only recover if you do this together. Meaning he has to trust you and allow you to help him. If he won’t cooperate and allow you to filter his computer, as well as set up a system where you or the Rav or someone else you can trust can monitor what he views and monitor how much time he spends on it and if he won’t work on himself then there’s no reason for you to stick around. I hate to say this but you need to find a way to get on his “devices ” and see why he spends so much time online. Is he hooked to gaming or is it something much worse? You need to find out. At the end of the day, if he won’t cooperate then you have no marriage and you will just get more and more miserable and he will get more and more addicted (and eventually ruin himself totally jeopardize his career and Yiddishkiet).
I’m just wondering, was he always so problematic or is this recent like the last few years? How long has this been going on?