Hi Francesco, Your sentence means that the buyer doesn't like / want the car he's looking at and he's going to keep looking for a car in another place. Sometimes people say "I'm just looking" which can mean they are not interested in buying at that point in time and are trying to see all the options available before they commit to buying something. Hope this helps you

It means that I don't want your car and I am going to look somewhere else for a car that I like.

You don't want to buy that car for the price they want. You will try to find a better car.