Conditional validation based on two dropdowns using JQuery Validator

I have spent hours trying to achieve the following validation using a custom validator method:

There are two dropdowns a user can select:

1. Current Location (Where user currently is)
2. Destination (Where user intends going)

What I am trying to achieve:
The validator should not allow a user to select the same location for both dropdowns except Location 1.

For example:
A user can select that he is going from Location 1 to Location 1. (Can travel to a different place in this location because this location is large).

But he cannot select that he is going from:
Location 2 to Location 2.
Location 3 to Location 3.
Location 4 to Location 4.
Location 5 to Location 5.
These locations do not have different places in the same location.

He can go from Location 1 to any of these other locations, vice-versa, or can go from Location to location, i.e Location 3 to Location 4.

Can you please help me out with this? What I have done so far is quite poor and not even working. The custom method is not working, I need to add rules and messages but do not know how.

Thanks in advance for any help!

What I have done so far:

HTML

<form id="rideForm" action="#">
<select id="3" name="currentLocation">
     <option value ="" class="inputDefault">Select Location</option>
          <option value="Location1">Location 1</option>
          <option value="Location2">Location 2</option>
          <option value="Location3">Location 3</option>
          <option value="Location4">Location 4</option>
          <option value="Location5">Location 5</option>
</select>

<select id="4" name="destination">
     <option value ="" class="inputDefault">Select Destination</option>
          <option value="Location1">Location 1</option>
          <option value="Location2">Location 2</option>
          <option value="Location3">Location 3</option>
          <option value="Location4">Location 4</option>
          <option value="Location5">Location 5</option>
</select>
</form

JS/JQuery Code

$(document).ready(function() {
    $.validator.addMethod("validSelection", function(value, element) {
        if ($('select[name="currentLocation"]').val() == $('select[name="destination"]').val()) {
            return true;
      } else {
            return false;
    }
});


("#rideForm").validate(
{
    rules: 
    {   
        currentLocation:
        {
            required: true,
            // validSelection: true
        },

            destination: 
            {
                required: true,
            // validSelection: true
        }
    },



    messages: {
        currentLocation: {
            required: "Please select your current location",
        },


        destination: {
            required: "Please select a destionation",
        }
    }

  });
});