Bustercrown, I really feel for you. I understand what you are saying. Basically, there really is not much you could do because according to your husband there really is no problem. Therefore, no matter what anyone here says about him seeing a therapist… is useless since your husband will not agree. I assume you are probably feeling bad. You are probably feeling like this is not what you expected from your marriage as usually one spouse would like to know that the other would listen to his/her concerns and at least be able to have a conversation about it even if the spouses disagree!
In your case, your husband won’t even listen to you. By him saying there is nothing wrong; if you think there is a problem, go to “wives’ of addictive husband supports”, you are probably feeling emotionally alone. Especially if he is always on the device, internet.. all the time-even simchas, he is surely not giving you the proper emotional support.
I am sorry that you are going through this, and I would like to tell you that realistically this could go on for a long time as the first step is that your husband needs to admit there is a problem otherwise he probably will not let you put a filter or.. on this device. So, get all the emotional support for yourself because this seems like a problem that could last for long.
I am sorry that you are going through this.