No problem. Obviously not the same situation but what you are facing i think is gonna overlap this but the bargaining and depression feeling is gonna be more severe as the reasoning is more serious, when a teenager or younger adult (like under 30 or something) and one parent cheats on the other, the kin is old enough to understand the situation, so they will be facing the death of their hero figure, a ideal parental figure, and sometimes the chance of that parental figure ever being an ideal one. In a way it’s worse than if that figure actually died. There are more people hurt, and more choices made you’d have no control over. So it’s recommended to talk to your siblings one on one in that situation, which I feel goes for your situation. They are going to be ‘grieving’ too and grieving effects everyone differently, so they may be on a different page, but even if your not, you may feel alone in this.

Unlike the parental figure cheating deal, your not really gonna decide the outcome as much when it comes to your relationship, it’s not gonna be possible for you and your fathers relationship to go back to how it was, although you still love your father, since who he directly wronged needs closure too. You love him for how he treated you, so honestly you can’t ‘kill’ that feeling towards him no matter how much it pisses you off. I don’t know what you should do, I don’t have an idea what’s best for you, when it comes to him being close and tryna talk to you. Although I said something about talking to your siblings, what they need for closure might not be what you need. To ever ‘forgive’ him (forgiving the crime and the person I feel not the same deal, I mean to not let yourself be held back by this) you might gotta confront the deal head on, might need to just cut him out of your life completely.

I hope any of what I wrote makes the slightest bit of sense.