Dreams like yours can be quite intense and often reflect deep-seated emotions or thoughts. Here are some possible interpretations of the elements in your dream:

1. Isolation and Loneliness: The scenario of being one of the last survivors can symbolize feelings of isolation or loneliness in your waking life. It could indicate a fear of losing connections with others or feeling abandoned.
2. Relationship Dynamics: The man you were dating may represent aspects of a relationship or feelings towards him. His actions in the dream, such as causing mass harm, could suggest underlying concerns about his behavior or the dynamics of your relationship. It might reflect feelings of powerlessness or fear regarding your emotional safety.
3. Loss and Grief: Watching the cat die while you held it could symbolize a fear of loss or an emotional burden you carry. It may indicate that you are processing grief or anxiety about losing something or someone important to you.
4. Communication Barriers: The mention of language barriers when suggesting traveling to Asia might symbolize challenges in communication within your relationships or a sense of disconnect with others. It could also reflect doubts about understanding or connecting with people outside your immediate circle.

Overall, this dream may be urging you to reflect on your relationships and feelings of connection or disconnection in your life. It might be helpful to explore these emotions further, either through journaling, talking to someone you trust, or seeking professional guidance if needed.