Healthy Relationships have an understanding between partners on the basis of clear and honest communication and where the involved individual's have a choice to be in that relationship. There is a sense of safety, trust and respects between partners and a willingness to negotiate when disagreements or conflicts arise.
Sources:
https://www.verywellmind.com/all-about-healthy-relationship-4774802
https://www.healthline.com/health/healthy-relationship
https://www.ny.gov/teen-dating-violence-awareness-and-prevention/what-does-healthy-relationship-look