Choice chip value does not update in flutter - flutter

Question

i'm trying to store a value coming from the selected choice chip in a variable called etatLabel, so I can send it alongside other values in a form. The problem is that once I first do the selection, the value gets stored successfully, but then the variable's value do not get settled to "" again. Which means if I hit the add button again it will add the value from the choice chip that was last selected.
here is my code:
String etatLabel = "";
class MyOptions extends StatefulWidget {
final ValueNotifier<String?> notifier;
const MyOptions({super.key, required this.notifier});
#override
State<MyOptions> createState() => _MyOptionsState();
}
class _MyOptionsState extends State<MyOptions> {
static const String failedString = "Echec";
int? _value;
List<String> items = ["Succés", failedString];
#override
Widget build(BuildContext context) {
return Column(
children: [
Wrap(
children: List<Widget>.generate(
items.length,
(int index) {
return Padding(
padding: const EdgeInsets.symmetric(horizontal: 5),
child: Container(
width: 100,
child: ChoiceChip(
backgroundColor: Colors.deepPurple,
selectedColor: _value == 1 ? Colors.red : Colors.green,
label: Align(
alignment: Alignment.center,
child: Text(
'${items[index]}',
style: TextStyle(color: Colors.white),
),
),
selected: _value == index,
onSelected: (bool selected) {
setState(() {
_value = selected ? index : null;
etatLabel = items[index];
});
widget.notifier.value = items[index];
},
),
),
);
},
).toList(),
),
],
);
}
}
I couldn't find a way to solve this, and I appreciate your suggestions/help.