Hi cat, welcome. I am so sorry for your pain, and it does sound horrible, betrayal x's 10.
IMO, what I would do is begin the process of my own recovery. There are no quick answers and you have been living with and addcit for a very long time, the unbelievability of it all is so hard to face. It will take time.
There are a bunch of stickies at the top of this section of the forum, it's a good place to start, lots of books to read that may be helpful, counseling for yourself, al anon, and of course lots of understanding and support here too.
One foot in front of the other, that is all we all have here. You will eventually get your sure footing again and make positive and healing steps forward.
You do not have to make any decisions today
Phew!
We are always here. sending you a big hug Katie