Miley Cyrus and Liam Hemsworth broke up primarily due to growing differences and conflicts in their relationship. Key reasons include:

• Miley was focused on her career and personal growth, while Liam wanted to settle down and start a family, which Miley was not ready for at the time. This misalignment on life goals created tension between them.
• Their marriage was partially motivated by shared trauma after losing their home in a fire, which added strain rather than stabilizing the relationship.
• Miley revealed there was "too much conflict" in the marriage and she desired stability and a drama-free life, which she felt was lacking.
• They had grown apart over time, spending much time apart due to work and lifestyle differences—Liam preferred a lowkey home life, Miley an active touring/music career.
• Despite the breakup, Miley stated her love for Liam remained and denied cheating rumors, emphasizing they simply evolved as individuals and decided separation was best to focus on themselves.

Overall, the breakup resulted from incompatible life priorities, emotional struggles, and strains in their ten-year on-and-off relationship and short marriage.