Thank you for answering!

I know deep in myself that I can't fix their problem if they don't want to, yet I keep feeling responsible. This night my father left and he is going to sleep elsewhere. He is conviced that my mother is cheating on him and she doesn't want him back. That's because she suddenly began going out, which she hasn't done for quite a long time. She started dancing lessons. Believing that she wouldn't lie to me, and relying on my intuition make me think its the truth. But my father is obsessed with his theories of conspiracy, which led to him asking stupid questions repeatedly, and drinking constantly. Naturally, this made things worse. In other hand, my mother did nothing to stop him, which only feeds his fantasies.