I think my mother is cheating on my dad and I think I should confront her about it.
How do you know your mother is cheating on your dad?
I saw her with another man in her bedroom when my father was at work.
It's awful that you had to find out about this like that. You should tell your mother that you know what she's doing and ask for an explanation. It sounds very hurtful for you and your father.
I know, it's just so hard to talk to her about this.
I'm sure you're upset over this and the damage it's doing to your family. Talk to her and tell her that you know she's cheating and how it makes you feel. You and your father deserve to know the truth.