: Negotiating new rules when feelings for a third party change from casual to deep.

Open relationships, also known as non-monogamous relationships, are romantic partnerships where both parties agree to engage in intimate relationships with others outside of their partnership. This can take many forms, from casual dating to more serious and committed relationships. Open relationships are often characterized by a high level of communication, trust, and honesty between partners, as well as a willingness to challenge traditional societal norms.