I'm so sorry you've had reason to join us, but I'm very glad you found us. You'll get tons of support & very helpful information here.
Sadly, what Skan says is true: far more often than not, there's more to the story than initially comes to light or is confessed to by the WS.
Read, read, read here on SI, particularly in the Just Found Out & General Forums as well as the Healing Library; you have a steep learning curve but the good news is you can benefit greatly from the experience of others.
I'm glad your WH has started therapy (I'm assuming individual? a.k.a. IC ). In my opinion, that is critical. He's the broken element; no point bailing out the boat unless you figure out why your first mate is drilling holes through the hull.
You should also strongly consider IC for yourself, if you haven't already. It is beneficial to have someone whose sole focus is helping you. You need to make a conscious effort to take care of yourself; it can feel impossible to eat, drink, or sleep adequately in the face of such a trauma, but each is essential. Of the three, not staying properly hydrated will land you in the hospital fastest.