Ever? Not even in the next thousand years? Not even in the next ten thousand? Ever is a mighty long time, my friend. A lot can happen in forever.
Think about it. Not even 150 years ago, most people, including the best academics, engineers, and industrialists, believed that heavier than air flight was impossible.
The Wright brothers proved them all wrong in 1903, and less than seventy years later, we were walking on the moon.
You’re arguing against yourself. Because forever is a long time, and because aliens would have already had forever if life occurs naturally everywhere, they would have been here many times already. They haven’t, aren’t, and won’t. Distance is insurmountalble...