So a bit of context, my room is hot all the time so I leave my window open in the winter when I don’t have my air conditioner in. This allows me to hear what’s going on in front of my house. I can hear my dad talking to someone on the phone and I overheard him say something to them. He said something along the lines of, “Sometimes I just want to meet up at a motel and have s*x.” I don't know what to think anymore. My mom is handicapped and has been for like 11 years now. I always have been suspicious of him. He goes into work and hour early everyday and he goes to the bowling alley 2 hours before he needs to. I don't know what to do. I never thought he actually would do anything like that. I feel so cheated and played.
Edit: I heard him say more. He said, “Just be the good girl that you always are,” and , “Here's a proposal: we meet up, have s*x, and if you don't want to be with me, I'll understand.” My sister tried calming me down since she was downstairs when all of this was happening. We found out who he was talking to: a friend of his whom he has known even longer than my mom. I couldn't believe it. He said he remembered “carrying her,” out of some place and should have kissed her and told him how he felt then and there. I hate him. I used to have one shred of care for him but now he has done it. I don't hate many people so he really messed up.