@CaveDivingbelle - firstly my thoughts and prayers are with you. It would be helpful if you could clarify what church you attend as different churches have differing positions on doctrine and how to handle things like this.
For my own, we believe that a husband may receive guidance for his family but also that he may not exercise unrighteous dominion either. At it's most basic your other half is manipulating you and that isn't right at all. Additionally, in my faith, our leaders may receive inspiration for us but not some random Joe Bloggs friend.
Forgive me for saying this, I might be looking through my own lens of experience, but it sounds like there is something in your relationship that isn't "right" in terms of what your OH believes God requires of him. This might be the obvious sex outside marriage thing or something else but I'll use unmarried sex as an example. I know you've indicated he is a long time believer, so if he has been raised in a faith and has internalised a message that sex is only to be done in marriage or at the more Orthodox side of the spectrum perhaps only done for purposes of procreation, and now your relationship and sex life is outside those restrictions, he is going to be massively conflicted inside. Perhaps even feeling that he is condemning himself to hell fire, the condemnation and damnation of God and all that. Unfortunately it may not be something in your control, a gambling addiction for example may meet great condemnation from your church but it isn't something you can help him with.
So what can be done to help? Well I would firstly strongly suggest that you both study together the atonement of Jesus Christ and His mercy. Very few throughout history are so grievous to be beyond it. If there is something you can do to set him right then great. That might be marriage, it might be confession, it might be refraining from a destructive practice.
I would strongly recommend that you do some further research about your particular faith. Most churches these days have a world of resources online that will enable you to be in a better position to protect yourself and prove to him how things aren't right.
I would also perhaps look at humility. His phone breaking might be divine intervention in his life, the entire O2 network unless he believes he's the second coming of the Messiah - far too big to be about him. If he does believe something like that then he absolutely has some major mental health issues. As far as believing he has a personal relationship with God though that's absolutely okay, it is everything else that isn't.
If you want to PM me any time feel free, I'm perfectly willing to listen and can assist you with any scripture references etc that you might find helpful.
Again my thoughts and prayers are with you.