AITA for giving my father the cold shoulder?

So about two weeks ago my father(41) and mother(42) let me(17m) and my sibling(15m) know that they were having troubles in their marriage. They had given accidental clues and stuff before that so we had a pretty good clue as to what was happening. The day they told us me and my brother didnt take it well he cried alot and i went to a friends house and cried there. Time skip about a week my father started hanging out with my moms best friend(35f) alot more then he usually did in that past week which was a little suspicious but i didnt do anything about it. My mom and her best friend were selling things at our towns rib fest

Saturday went fine nothing was out of the usual that night but when i woke up on sunday the calender was torn of the wall and when i asked my father about it he said “me and your moms best friend are no longer friends” i thought he was joking since he made jokes like that all the time so i shrugged it off and went about my day. I had made plans with my friend to go to the ribfest and when we got there i said hi to my mom and her friend but when i saw her friend she told me she wasnt coming over anymore almost guiltily which again wasnt weird as shes going through her own problems with marriage so again i shrugged it off and went home and my dad was pretty angry with something so i asked him what he was so angry about and he said he had cheated on my mother with her best friend and thats when it all clicked for me all the signs and stuff that were shown. I said “that checks” and went off to play video games with my friend, my father came to check on me and i was giving him short answers like “ok” and “yea” and i wasnt in the mood to talk with him.

The next day he had work which was fine i went about my day normally but when he got home my mood changed and i was glaring and ignoring him and giving short answers yet again. And the same the next day so i sent him a text last night about how i dont wanna talk to him and that i still love him cause hes my dad but what he did was kinda a bad move on his part and that ill need a week or so to collect my thoughts about him and probably forgive him. So here i am wondering AITA?