Explaining that you left a role for personal reasons is acceptable, as long as you keep it vague and professional:
"I decided to leave my previous job due to personal reasons, but I have resolved those matters and am eager to continue my career."
"At the time, I needed to prioritize my personal life, but I am now excited to explore new opportunities and bring my skills to a new organization."
Key takeaway: Keep it vague and reassure the interviewer that your personal reasons have been resolved.