My parents are getting a divorce... First time seeing my dad...

My parents are getting a divorce... They got 5050 custody of me and I have to go to my dad's house for the week tomorrow. He cheated on my mom... With my MALE civics teacher. I was so upset and was crying. I asked my dad does this mean he's gay now and he said "Idk..." And was crying too. I dropped that class... Idk how it will be when I see my father... We've always been close... But he broke mom. She's started drinking and has gotten abusive towards me telling me I'm a pos like my father and threw a bottle of vodka at me... I love my mom so much but she's so hurt and taking it out on me... And now I gotta go see my dad in his new apartment with his new man... My life if falling apart..

Edit: My mom is always drinking though... When I tried to talk to her she slapped me and called me a bitch....

@Julia do I have to tell him right away.... Can I at least see how the first few days go..