It’s so strange!!! You don’t want it to turn like so but the movement start running from it, you already planted a seed. ‘Toxicity’ it is. Haha you always be mindful that you won’t make your relationship anything near to that but you yourself grow into one toxic person in that relationship. Congratulations, you couldn’t do anything in life just be toxic to everything. Why it has become an inherent in this generations of relationships that someone or something starts being toxic. Please can someone write an manual how to detoxicfy a relationship or a person step by step?
Simple answer - Therapy and time.
Most of the people turn into people they hate. So you have to take therapy and consciously work on yourself for a long period of time to not turn into what you hate.