How do you walk away from a toxic relationship?

Life is a philosophy and each is a metaphor to the other. If you can see copulation as a metaphor, then there is engagement, indulgence, climax, and withdrawal to everything. And there is no connection between one event and the other. So even a good and exciting relationship must have a withdrawal phase, as one partner is away for months and then a reunion happens, making the relationship last. Overindulgence and continuous engagement only lead to saturation, making no difference. Anything that does not make a difference becomes monotonous, which is against nature.