Please start keeping a diary. Write down everything of importance since things started going downhill. Put approximate dates if you can’t remember exactly.
Keep adding to it every day.
Sometimes seeing your own private thoughts in writing can help clarify.
And this could be helpful in the future if it comes to a petition for a decree of nullity.
I hate to say that. You want to fight for your marriage. But if the groom already wants a trial separation 8 months into it, something is fundamentally and seriously wrong. Whatever deception has been going on, whatever it is that you know, and are rightly keeping to yourself, it may be of supreme interest to determining whether you even have a marriage at all.
I know this hurts. I’ve been through it. In a different way. Stay close to the sacraments. Pray a lot. You need clarity of thought in this.