Angular Js: validating duplicate object key in table

I have a table with two column "user type" and "user Name" User type having a drop down selection So that i can select predefined user type and place a name in User name. There is a Add button on each click i am adding one another row.

I am doing one validation here So that user can't selected repeated "User type". for example from row 1 is i select "value 1" from drop down. then from row 2 i should not be able to select same value. Anyway this validation works fine. but there is one scenario if I add a duplicate row, then remove it right away, I am still unable to save because the validation error is still there.

here my jsp-

      <div ng-class="{'col-sm-9'}" class="col-md-10">
        <table class="table table-bordered table-striped table-hover table-condensed">
            <thead>
                <th>user type</th>
                <th>user Name</th>
                <th></th>
            </thead>
            <tbody>
                <tr ng-repeat="object in edituserConfig track by $index" ng-form="jobfileForm">
                    <td><select class="form-control" ng-model="object.key" required ng-change="reValidateJob()"  name="jobFileKey" ng-init="object.form = jobfileForm">

                            <option style="display:none" value=""></option>
                            <option value="value1">value1t</option>
                            <option value="value2">value2</option>
                            <option value="value3">value3</option>
                            <option value="value4">value4</option>
                            <option value="value5">value5</option>
                    </select></td>
                    <td><input type="text" class="form-control" name="jobFileName" ng-model="object.value" required/></td>

                    <td >
                          <button class="btn btn-danger btn-sm" data-style="zoom-in" ng-click="edituserConfig.splice($index,1)" ng-form="jobfileForm" title="Delete">
                                 <span class="glyphicon glyphicon-remove"></span>
                          </button>
                   </td>
                </tr>
                <tr>
                    <td colspan="3">
                        <button class="btn btn-primary btn-sm" ng-click="edituserConfig.push({'key':'','value':''})"    title="Add Value">
                            <span class="glyphicon glyphicon-plus"></span> Add Value
                        </button>
                    </td>
                </tr>
            </tbody>
        </table>
        </div>

My controller-

        $scope.reValidateJob = function(){

                angular.forEach($scope.edituserConfig, function(fieldMapO) {
                    var count = 0;
                    angular.forEach($scope.edituserConfig, function(fieldMapI) {
                        if(fieldMapO.key == fieldMapI.key){
                            count ++;
                        }
                    });
                    if(count >1){
                        fieldMapO.form.jobFileKey.$setValidity("duplicate",false);
                    }else{
                        fieldMapO.form.jobFileKey.$setValidity("duplicate",true);
                    }
                });
            };

Please advise me on delete button do i need to vaidate all the row again? any good solution?