A reflexive relation is like giving someone a hug. When you hug yourself, you know that it's you hugging yourself because you're the same person. And no matter how many times you do it, you're always hugging yourself.
In the same way, a reflexive relation is when something is related to itself. It's like saying "I am related to myself". It's always true and never changes no matter how many times we say it.
For example, a reflexive relation in math would be like saying that every number is related to itself. This is always true because every number is the same number.
So, just like when you give yourself a hug, you can always rely on a reflexive relation being true because it's a way for something to be related to itself.