You need to save the result of your call to add the binding to the delegate like so:
FDelegateHandle MyHandle = MyDelegate.AddRaw(this, &FMe::OnThing);
...
MyDelegate.Remove(MyHandle);
You need to save the result of your call to add the binding to the delegate like so:
FDelegateHandle MyHandle = MyDelegate.AddRaw(this, &FMe::OnThing);
...
MyDelegate.Remove(MyHandle);