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Guys, My boyfriend broke up with me after 2 years for no apparent reason?

So genuinely it was so sudden it shocked me and everyone around us. Everyone was equally confused as me. One minute everything's fine, like making plans for our wedding one, going to his family's for Christmas, then one night he just curls in on himself next to me on the couch and starts sobbing and I mean sobbing. Everytime he looked at me he cried even harder and barely got the words I dont think this is working out out. I got up to leave from pure shock and heartbreak and he panicked? He kept asking me why and where im going and if i was even safe to drive. He then called me twice and texted me asking to tell him im safe. Now the two weeks before this happened he started going to work 7 days a week. No day off and I saw his mental health plummet. He had no energy, was barely eating, was coming home and first thing was to get a drink and smoke. Before this everything was good, he was happy with me he said he could see the progress I was making at home and in life. We were happy I dont understand what happened and why. I came home the next day and he had set up his spare phone pointed directly at the front door and then suddenly he comes home 4 hours early from work and says hi to me very timidly, he asked a random question then he just stared at me? And then left again when I didn't say anything. The next day i went back (for my cats by the way) he was talking to me animatedly showing me his cleaning and asked if id eaten yet it caught me off guard. When I went to leave his tone completely dropped and all he said was okay. Since then he's messaged me about random things 4 times in one day, he asked me why i was still doing chores in the place I dont live in (it was my home too for over a year I dont understand why thats an issue but okay im just sleeping at my parents). Its all so confusing and heartbreaking and I just want him back but im stuck in this confusion and uncertainty and I dont know what to do or make of any of it

Guys, My boyfriend broke up with me after 2 years for no apparent reason?
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