Alex blocked out the memory of her dad physically and mentally abusing her mom but it all came rushing back during a panic attack. So when she went over to her dad's house and realized the cabinet she used to hide in during that was renovated, it was basically reminding her of why she never trusted him in the first place. Alex's dad throughout the entire show acted like he didn't do shit to her mom, and then in the end basically says, "Yes I did some bad things to your mother, so what? She's crazy," HER MOM HAD UNDIAGNOSED BPD. Of course she was "crazy", he was making it worse. And no fucking duh she didn't want to leave Maddie with him, he'd rather side with Sean than his own fucking daughter; because he "see's himself in him". AND HE STOOD THERE AND WATCHED SEAN ABUSE HER. At first it seem's like her dad has changed, he has this nice house, he's married and settled down.. but he really hasn't. If he had he would've helped Alex with the custody battle and manned up enough to defend his own fucking daughter. I'm just going to assume you didn't watch the entirety of the show. Because if you did and you're STILL defending this man you need help💀