My boyfriend randomly broke it off after a year

TL;DR
My boyfriend and myself ‘M/20’ and ‘ F/20’ have been together for a year and just celebrated our 1 year anniversary. we just went on a private vacation for days on end. We are the bestest of friends and have barely ever argued or disagreed. We have all the same interests, and we spend most of our lives together. He’s called me three times a day every day since we met. The second day he knew me he confessed his love, and since then he’s called me his wife, would daydream with me about our wedding and our lives together. He brags to all of his friends about me, has photos of me in his wallet that he shows off. I’m extremely close with his entire family and just spent the whole week with him and his family. Last night, he came over to my house and said that he felt drained by me, and had our entire relationship, and never said anything. Totally out of left field. He cited my chronic illness as a problem for him, which he’s been nothing but support of. To preface, my illness is pain related and doesn’t require major intervention. I just sometimes need accommodations like a place to sit. months ago we had a chat because I tend to not ask for help and he wanted me to accept and ask for help more. But now he’s saying it’s a huge drain on his life and he was contradicting himself the entire conversation, and insulting my character saying that I’m “just too miserable” and he’s “waiting for something in my life to go wrong”. But I have dozens of friends who always pride me on my bubbly- ness and know me as a ray of sunshine. I have manageable depression from my teenage years (which he knew about and resonates with) but my life has been very good for the past four months and I have little complaints. Between his behaviour at no point changing, and in fact telling me how happy he is constantly and how much he loves me, yesterday he said he can’t see a future with me anymore. We spent the morning with his family for Father’s Day and nothing seemed wrong

I’m in genuine shock and heartbreak and had to get my mom to pick me up and take me to her house and look after me. I can barely walk, I can barely breathe. The people I’ve told can hardly believe that this has happened because this man is so infatuated with me and makes it known. If anyone has any ideas about what could be going on based on their experiences, I’d love the feedback. Does anyone know what I should do? I’m just so lost right now and so shocked, in just not thinking straight.

Thank you for reading xxx