With astronomical proofs, the sun does not have enough mass to collapse into a black hole.
I believe that in billions of years to come when the sun is at the end of its life, it will become a "red giant star".
Then, when it has used the last of its fuel, it will throw off its outer layers and turn into a glowing ring of gas called a "planetary nebula"
Finally, all that will be left of the sun is a cooling "white dwarf star".
A "red giant star" is a star that is larger than the sun and red because it has a lower temperature while the "the white giant star"was already explained in my article.
So, black holes develops periodically and grows bigger and bigger into supermassive black holes. It therefore entails that, it never stops existing..