Am I tripping? or is he not it?

My older sister 23(f) is dating this guy who I think is in his early thirties. They met about two years ago but they broke up for a while because he was abusive and once put her outdoors s with no clothes on a threw a plate of food beside her while she was crying. Fast forward to about 8 months ago she told me they got back together but she kept it a secret from me until recently. Something doesn’t feel right to me tho. She says he’s changed and “in his Bible” now but I don’t know. One day she told me she had a headache and asked for a Tylenol but he suggested she take a Perc. Now she says she takes percs every 4 days but “knows her limits” I’m just worried about her. She’s in a tough spot and has no one else but me and our uncle because our mom is abusive. I need someone else’s opinion really.
Am I tripping? or is he not it?
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