Hi Snuggles, I'm really sorry you're having to go through all of this
And by the sounds of it, it will take time and you're probably going to need to go through lots of different emotions, and not easy ones.
But as for wanting to sort things out a little.........I'd say that you've already done an amazing job in starting to put together some of the "framework"/support to allow you to do just that, in time...........you've sorted out the most important thing, by starting to talk about it, by telling your T (all/some of??) what has happened you've already made a big step.
And you're not going to be alone!!
Maybe there are specific sites online that can help, maybe there are particular forums on here that can help, but either way you have us too!!
And we can be with you for each of those "one step"'s at a time.
You can make it through this..........things might not go back to just how they were, it might take time..........but you can make it through this.
And you know through all of this, now you know, it might even gradually lead to strengthening your relationship with the person involved. Maybe??

Alison