If your future self tells you to alter something in the present, and you do so, would that future self ever have existed to tell you to change something?

Here's the logic:

Future self comes, says change something
You change it
that future self never existed, so it never came
????
Profit?

Youre right

but what profit did you make, if i may ask?

Reference to the internet, my child.

Would your present self just assume it was his/her own decision?

no idea

wicked thoughts tbh

Of course your present self would not assume it was his decision.
He would explode from having thoughts like the ones previously stated in this thread

he would still exist in a separate universe,

when he came back in time and changed the universe his existence would not cease to exist but he created a parale universe ,

there are an infinate number of parlel universe so that means ever possible option or outcome has or will happen, in one universe you will win the lottery every day for the rest of your life in a another one you will have died as a child

Are we using Terminator or Back to the Future time travel rules?

I prefer the futurama time travel rules tbh.

If every possible option already exists, how can he "create" another parallel universe?