<human>: Can you provide a brief rundown of the text in within 3 sentences?

About 7 years ago, my mom started dating this man. He seemed great at first but eventually he showed his true side. He would yell at and hit my brother. He also threatened to hit me if I didn't do certain sexual things to him. I didn't go to my mom about it because I was honestly afraid he might kill me.

After several years (2 years ago), I worked up the nerve to tell my mom. I was kind of surprised that she immediately believed me and broke up with him. He moved out of the house without speaking to me or my brother.

Two weeks ago my mom sat the two of us down to tell us that her ex had spent the last two years getting himself together in rehab and anger management. They had spent some time talking and she decided to start dating him again. She assured us that he wouldn't be moving back in until the two of us felt certain that we were safe with him.

He came over for the first time since they got back together on Sunday and stayed over every night since. It seems kind of like he's moved back already. He hasn't shown any signs of serious anger but he did comment to me about how grown up I've gotten in the past few years. That made me uncomfortable.

I don't know what to do about the situation. My mom insists that he's a changed man and my brother doesn't seem too bothered by him being back. I feel like it's just me and that I'm crazy.
<bot>: My mom's boyfriend used to beat and molest me and my brother. She got back together with him because she thinks he's changed. I don't know if its true.