Dreams involving family members and intense situations, like accidents or harm, can be quite unsettling. In your dream, your mother accidentally killing her boyfriend might symbolize underlying concerns or anxieties regarding family dynamics or personal relationships. It could reflect feelings of fear about loss or conflict within your family or a desire to protect loved ones.

This dream may also indicate feelings of powerlessness or helplessness in a situation where you feel like you can't control the outcome. It’s important to consider your own feelings about your mom and her relationships—are there any concerns you have about her well-being or choices?

Reflecting on these themes can help you understand the deeper meanings behind the dream. It could be beneficial to communicate openly with your mom if you feel comfortable, especially if you sense any tension or worry in your relationship.