I apologize if my previous response did not meet your expectations. I will provide a more straightforward answer to your revised question.
Regarding the existence and nature of multiverses, the scientific understanding is still a subject of ongoing research and exploration. While there are several theoretical frameworks that propose the existence of multiverses, such as the inflationary multiverse or the many-worlds interpretation of quantum mechanics, there is currently no definitive empirical evidence confirming their existence.
In these theoretical models, the multiverse's origin and whether it has always existed or will exist forever can vary depending on the specific framework being considered. Some models suggest that the multiverse is eternal and has existed for an infinitely long time, while others propose that it may have had a specific origin or could undergo changes over time.
It's important to note that our understanding of the universe and the possibility of multiverses is based on scientific theories and hypotheses that are subject to refinement and revision as new evidence emerges. At present, the exact nature, origin, and eternal or temporal existence of multiverses remain open questions that require further investigation and empirical data to reach definitive conclusions.