My bf (M34) is on testosterone replacement, doesn’t find me (F28) attractive, prefers porn

Me and my bf have been together a little over a year. He discovered he has low testosterone levels and decided to opt for a replacement therapy 6 months ago. We've had hot sex at the start, but he was rarely reaching an orgasm, and lately he needed to watch porn whether we have sex or I give him oral to get turned on.

He claims he finds me sexy and beautiful but says he doesn't feel attracted to me anymore. He struggles to stay hard says he feels emotionally disconnected from me, even when I am trying really hard. We sometimes argue but I always try to provide him with what he needs and always happy to give him a BJ. He often doesn't feel like having sex and in his guilt gives me an oral orgasm too.

Last week he watched porn everytime we had sex or I gave him an oral to be more stimulated. He claims his lack of sexual urge is due to his low testosterone levels, but also said this has never happened before in a relationship. I tried dirty talking and fancy dressing but doesn't seem enough and it’s also unsuitable to keep up. I can’t help but feeling like I am boring him the f out.

We love each other but I am not sure what to do, sex is becoming more frustrating and I have lost all of my self-esteem (I have never had this happen to me before and always managed to satisfy my partners). Is he addicted to porn? Is it his lack of satisfacti with his own life? Could it actually be the testosterone replacement even though his results came back recently and he had good levels again - in which case I want to be patient and understanding.