My husband and I: Sexless marriage

My husband is 48, I am 34, we have been married two years, together almost four. We have not had sex in a year and a half. Any time I try, he rejects me. I recently noticed he was watching porn and pleasuring himself, I even caught him in the living room watching porn on his phone, pleasuring himself. Anytime I try to talk about it, it ends in a big fight. He recently saw a doctor and had his testosterone checked. It was low so he started testosterone injections. When I asked him why he prefers to pleasure himself than have sex with me, this was his response, “You just don’t fuckin understand. Stop thinking and fuckin take a chill pill. I went to the fuckin doctor. I’m taking injections now cuz of the doctors. We just had sex and you want more more more more more now pull your fuckin head out of your ass and stop.” I am at a loss and need advice on how to handle this.