1) Lack of trust or constant jealousy. 2) Controlling behavior or excessive possessiveness. 3) Lack of respect for boundaries. 4) Frequent lying or deceit. 5) Emotional or physical abuse. 6) Inability to resolve conflicts healthily. 7) Lack of support for personal goals. 8) Constant criticism or belittling. 9) Significant differences in core values. 10) Unwillingness to commit or discuss the future.