ng-messages dont reset when resetting the form - angularjs

Question

I have a big problem in my form when I try to reset it everything is reset except the ng messages. I tried everything but nothing worked. I don't know why
Here is my form:
<md-content layout-padding>
<form name="projectForm">
<div layout="row">
<md-input-container flex="50">
<label>Name</label>
<input required name="clientName" ng-model="project.clientName" ng-focus="">
</md-input-container>
<md-input-container flex="50">
<label>Email</label>
<input required type="email" name="clientEmail" ng-model="newEmployee.email"
minlength="10" maxlength="100" ng-pattern="/^.+#.+\..+$/" />
<div ng-messages="projectForm.clientEmail.$error" role="alert" ng-show="message">
<div ng-message-exp="['required', 'minlength', 'maxlength', 'pattern']">
Your email must be between 10 and 100 characters long and look like an e-mail address.
</div>
</div>
</md-input-container>
</div>
<div layout="row">
<md-input-container flex="50">
<label>Mobile</label>
<input required name="clientName" ng-model="newEmployee.mobile">
<div ng-messages="projectForm.clientName.$error" ng-show="message">
<div ng-message="required">This is required.</div>
</div>
</md-input-container>
<md-input-container flex="50">
<label>Address</label>
<input required name="clientName" ng-model="newEmployee.address">
<div ng-messages="projectForm.clientName.$error" ng-show="message">
<div ng-message="required">This is required.</div>
</div>
</md-input-container>
</div>
<md-input-container class="md-block">
<label>Description</label>
<input md-maxlength="30" required md-no-asterisk name="description" ng-model="newEmployee.description">
<div ng-messages="projectForm.description.$error">
<div ng-message="required">This is required.</div>
<div ng-message="md-maxlength">The description must be less than 30 characters long.</div>
</div>
</md-input-container>
<div>
<md-button type="submit" class="md-raised md-primary">Submit</md-button>
<md-button ng-click="cancel()">Cancel</md-button>
</div>
</form>
</md-content>
and here is my reset function in the controller
$scope.reset = function() {
$scope.projectForm.$setPristine();
$scope.projectForm.$setValidity();
$scope.projectForm.$setUntouched();
}