He wasn’t taking care of himself. Maybe it wasn’t the best idea to break up with him over it but… how else would he start caring for himself? He always showed signs of being obsessed with you. So why wouldn’t he start looking after himself if it meant you’d get back with him?

Breaking up with him was a dangerous mistake

You heard a loud clatter in your house while you were sleeping. You went out of your room to look but didn’t find anything. So you went back into your room to sleep again