The concept of the universe expanding infinitely does not necessarily imply the existence of an "end" or a boundary. It's important to clarify that when scientists discuss the expansion of the universe, they generally refer to the continuous stretching of space itself rather than the universe expanding into a pre-existing space or an empty void.
According to our current understanding, the expansion of the universe is described by the Big Bang theory, which suggests that the universe originated from a highly dense and hot state approximately 13.8 billion years ago. Since then, the universe has been expanding, with galaxies and other cosmic structures moving away from each other.
The idea of an "end" of the universe might stem from an analogy with familiar concepts like the edge of a physical object or the boundary of a region. However, in the case of the universe, there is no conclusive evidence or theoretical framework that supports the existence of an outer boundary or an end point. If the universe is indeed infinite, it would not have an end; it would continue to expand without a definite boundary.
It's important to note that our understanding of the universe is based on current scientific theories and observations, which are subject to refinement and revision as new evidence and discoveries emerge. The nature of the universe and whether it is truly infinite or has other properties beyond our current comprehension are fascinating topics of ongoing research and exploration in cosmology.