I'm unbearably sad

My closest friend got detained under section 2 of the mental health act in the UK and is currently on a psych ward. I've visited him twice, and while emotional, it seemed to help him. I went for my third visit today only to be told he's not up for visitors. She apologized I'd come a long way, but there was nothing she would do. I left and called just to see if he was up for a chat and was told he'd rescinded consent for me questions or anything like that.

I'm in tears as I write this. I love him so much and I'm distraught from overthinking. Have I offended him? I wrote him a letter and gave it to him last time and it was just me expressing love and how I'll always be there for him no matter what, and marveling at his resilience.

I'm just so sad.