In the Marvel Cinematic Universe, the relationship between Thor Odinson and Jane Foster was established in the 2011 film “Thor,” directed by Kenneth Branagh. However, in the subsequent films, “Thor: The Dark World” (2013) and “Avengers: Age of Ultron” (2015), it is implied that the two have broken up. The exact details of their breakup are not explicitly stated in the films, but there are several factors that may have contributed to their separation.

Firstly, in “Thor: The Dark World,” Jane becomes infected with the Aether, a powerful substance that possesses her body and puts her life in danger. Thor brings her to Asgard to seek help from his father Odin and his brother Loki, but Jane’s condition worsens, and she eventually ends up in a coma. Thor is torn between his duties as the prince of Asgard and his love for Jane, and he ultimately decides to save her by taking her to the hidden world of Svartalfheim, where the Aether can be extracted from her body. This decision puts both Thor and Jane in great danger, as they are pursued by Malekith, the Dark Elf leader who seeks to use the Aether to plunge the universe into darkness.
Although Thor and Jane are reunited and ultimately defeat Malekith, their relationship is strained by the events that have transpired. Jane is understandably traumatized by her experience with the Aether, and Thor is burdened with the weight of his responsibilities as a prince and a hero. Their conflicting priorities and the dangers of their world make it difficult for them to maintain a stable relationship.
Another factor that may have contributed to Thor and Jane’s breakup is their distance from each other. As a resident of Earth, Jane is separated from Thor by an intergalactic divide, and their relationship is further complicated by their respective duties and obligations. Thor is a prince of Asgard, tasked with protecting the Nine Realms and maintaining peace in the universe, while Jane is a scientist who is dedicated to her research and her work on Earth. Their lives and their worlds are vastly different, and this may have made it difficult for them to find common ground and maintain a strong connection.
Additionally, in “Avengers: Age of Ultron,” Thor experiences a vision that reveals the existence of the Infinity Stones, powerful artifacts that have the potential to destroy the universe. Thor becomes obsessed with finding the stones and preventing their misuse, and he leaves Jane behind to pursue his quest. This further distances the couple from each other and may have contributed to their eventual breakup.
It is also possible that the breakup was simply a result of the natural course of their relationship. As in many real-life relationships, Thor and Jane may have grown apart over time, especially given the challenges and difficulties they faced. Their relationship was initially based on a mutual fascination with each other’s worlds and cultures, but as they spent more time together, they may have realized that they were fundamentally different and unable to reconcile their differences.
In the end, the exact details of Thor and Jane’s breakup are left open to interpretation. However, the films suggest that a combination of factors, including their conflicting priorities, their distance from each other, and the challenges they faced, contributed to the demise of their relationship.