I subscribe to the belief that infinity exists only for one entity, that being whatever it is you believe IS. Not something that began to exist but something that, apart from its existence reality simply isn’t. Without such a concept, nothing is possible. You may ascribe those attributes to the universe if you believe in an eternal cosmos. You may ascribe those attributes to a deity. Or something else. If you believe in the law of cause and effect and are willing to challenge yourself to asking for a cause in succession, you’ll either end up in an infinite regress or account for the existence of some type of uncaused cause. As for mathematics, you may ask yourself: 1/3+1/3+1/3=1, so what is 0.33r+0.33r+0.33r=?, where the “r” represents a repetition of the same digit. Well, is that 1? Or is that 0.99r? You see, the 1/3+1/3+1/3 is true but do you truly ever cut the apple into exactly 1.33r of a slice? No. These things are mostly a demonstration to us, a visual example of something purely conceptual. Yet, it’s also true to note that certain things have no end. Go check out Mandelbrot sets and enjoy the beauty of numbers.
By the way, much of what I said is purely my opinion and I’m not passing it off as fact. There is debate about the reality of “infinity” as it pertains to mathematical realities of everyday life.