Maybe I need an advice

Hi everyone

I just found this forum, which seems like a ray of light in the middle of the dark.
6 months ago, after a year of abnormal behaviors and fights, my boyfriend accepted that he is addicted to P (I discovered suspicious advertising while watching movies and I told him) since then our relationship has become a roller coaster.

The trust was totally destroyed. For almost a year and a half I thought that I was doing something wrong in the relationship and other negative thoughts about myself, I lost all my self-esteem and my security... Until today, it has taken me a lot of effort to heal and although he has shown he really wants to heal, I can't trust him so fast. He took therapy 2 months, but then he couldn't afford it and started many healthy activities to get distracted, sold his smartphone and discarded his own computer to not use the internet. But he had two relapses at the beginning of his recovery, in one he confessed that he rented a computer to send an email but then couldn't help looking for P. That broke me again. The days passed and we managed to overcome it. But the last months have been an struggle, happy moments and suddenly really hard days for the relationship.
Today by chance when checking my Facebook I saw that he had recently logged in, which intrigued me too much, since he has no access to the internet or computer. When asked, he confessed that he had rented a computer in a cafeteria again but only to check his Facebook messages. We started an argument, because I feel that he is putting himself at risk, now he thinks he can control his addiction by himself and that I am not confident that he can achieve it. He blames me that "I can't see his effort" and that hurts him.
I don't know what to do, I just told him that I wouldn't continue with the relationship if he doesn't go to therapy and continues using the Internet during his recovery. Am I being really exaggerated? I don't know how to handle this situation, I trust his effort to recover, but I know addiction is not that simple. I feel exhausted.

Thank you for reading.