I'm so sorry...Even though you figured as much, boy does it suck to get it confirmed in such a concrete, in your face way...and it feels like watching a train wreck, and you know you should turn away, but you just can't... been there waaaay too many times over the last million years.
Hang in there...sounds like you've given yourself some time to process things...
And you are right...it's now way out in the open. No way to ignore or look the other way and act 'as if' it's still unknown...(like I still do since technically i really only know what I know because 1) I'm pretty observant and 2)i snooped!)
Maybe this becomes the time to set some more explicit boundaries. Maybe this becomes a real opportunity for you to show your strength in a very deliberate way...
