Do you trust me

Is it possible to truly trust somebody. I dont think it is possible to truly trust someone. You can trust someone to the 99% percentile but ever to the fullest. Events can be put in place that can strain relationships whether between family members, spouses, or best friends. An example is if two best friends were marooned on a island in the middle of the Pacific. They have a limited amount of food. At a certain point the food comes down to a couple chicken wings and some fresh water. If one friend said that hes going into the island to look for food and told the other friend to not eat the entire meal even though thier both cannabalitic starving could he trust him. The friend would watch him dissapear into the jungle and then throw down all the food. Maybe say a bird came down and ate it. This is a drastic example but if you spread out you can see you can never truly trust anyone, even your parents at some point.