What is the current scientific understanding of the "flat line" phase in pornography-related concerns?

Dear Doctor, I hope this message finds you well. I am reaching out to discuss some concerns that have been affecting my mental and sexual health, specifically related to my use of pornography and its broader impact on my life. I am a male, 26/27 years old. No health issues. I've noticed that my consumption of pornography and engagement in cybersex have escalated to a point where they negatively affect my life and relationships. My need for increasingly explicit material to achieve sexual arousal has grown over the years (a phenomenon called "Desensitization" i believe), and it's become apparent that this pattern is not sustainable. I've observed that this habit has not only affected my ability to enjoy real-life sexual encounters but has also contributed to the deterioration of my previous relationship. At times, I had found myself needing to think of pornography to maintain an erection during sexual intercourse. In an attempt to address this, I've tried to quit watching porn, only to experience a significant drop in my libido and desire for sexual activity. This "flat line" phase, as it's often referred to in various forums, has left me feeling worried and uncertain about the path forward. Of course, i started watching again, just to make sure that everything is normal. The first couple of times, the erections were weaker than usual. I understand that the body of scientific research in this area is still evolving, and there seems to be a lack of definitive guidance on dealing with these challenges. Given these complexities, I'm seeking your professional advice on several fronts: 1- Is the "flat line" phase a recognized scientific phenomenon, and what does current research say about it? 2- Considering my concerns about the long-term effects of abstaining from pornography and reduced masturbation, what guidance can you provide? I'm particularly worried about maintaining sexual function, including erectile strength and ejaculation control. 3-Could you suggest any scientific, medical research articles or resources that could offer more insight into these issues? Your expertise and any evidence-based recommendations would be immensely valuable to me as I consider my next steps. Many thanks for your time and consideration. Kind regards,