Eryn,
so sorry you had to find us.
You have experienced a trauma, and it will take YEARS to recover, typically 2-5. I just want to be realistic with you. So any type of reconciliation (R) is a long journey full of lots of twists and turns and big ups and downs. So if your emotions are all over the place, totally normal.
What is your WS (wayward spouse) doing to fix this? Is he seeking professional help like IC (individual counseling)? Is he going to NA to stop with the weed? Is he digging deep into why he continued if it was so awful (and I frankly find that one a little hard to believe 🤷♀️ — maybe in retrospect it was bad, but he kept on going back so….)?
He needs to get tested for STI/STD and so do you. Who knows what she may have shared with him, and we’ve seen too many stories where people caught something from their WS. Do not have unprotected sex until you are both tested and he shows you the results.
Are you in IC? That will help you process what you want and need going forward. R can be possible, but don’t promise it yet. You need him to prove that he is truly changing and becoming a safe partner, and it will take a long time for you to trust again. Totally normal, just the way it is. Share with people in your life who will support you no matter if you R or D (divorce). As you see with your sister, some struggle with this, so choose carefully who you share with, but get support if you need it. If he is embarrassed or ashamed, too bad. Just a consequence of his actions.
Please take extra good care of yourself - eat healthfully, drink lots of water, get some exercise and sleep. Avoid alcohol and drugs as they don’t help when you are in crisis.
Do not let him blame you or the ‘rough patch’ or even the AP (affair partner). She may have pursued, he may have been sad and feeling uncertain, but he made 100s of choices to cheat and lie to you. That is 100% on him. All marriages have rough patches. Life gets tough sometimes, but he needs to find out why, out of the zillions of choices he could have made, he chose to betray you. How else can he figure out how to never let that happen again if he doesn’t get to the root of why he did it this time. This is also why we don’t recommend marriage counseling (MC) at this time. The M wasn’t the problem. He was.
Has he voluntarily shared all passwords and location with you? Is he reading up on the effect of trauma and infidelity on marriages and the BS (betrayed spouse)? He really needs to be driving this - his made, he needs to take the lead in fixing it.
Keep posting. Let us know if you have kids, your own income, etc. It will help us advise you better as you manage through.
Oh, and read in the Healing Library and look for all the posts with the bullseyes in the Just Found Out forum. You may have to go back a few pages, but there is gold in some of these posts and resources that will help you.
Lastly, trust that you will get through this. It will suck and take longer than you want, but you will get through it.