Please Help Me

I am in so much pain right now. I never thought I would be posting this, ever. So I'm 20 years old. Last week, my 19 year old boyfriend of nearly four years broke up with me. He did it at 3 AM, pretty much out of the blue for me. However, I have since learned that he was very depressed and felt like a burden to me, and he felt that I was growing distant. I genuinely thought he was just too busy to have full conversations with me, so I tried my best to keep the conversation to a minimum. Well, after breaking up with me, he slowly proceeded to get rid of me, first by unfriending me on Facebook, then blocking me on Instagram, and blocking me on Messenger, though he did unblock me on Messenger a couple of days ago. He just hasn't spoken to me since the morning of the breakup. I heard from various mutual friends that he hasn't seemed like himself, and they think him breaking up with me was a mistake. I feel like an idiot, but yesterday I did wish him a Merry Christmas. He hasn't seen the message and hasn't responded. I want to fix it so badly, but I feel like it's too late now. I feel like he's ignoring me. I need help to get over this. I've tried other apps but I have to pay to use them, which I can't afford to do at the moment. Was it wrong of me to reach out? I don't know what to do. I really don't know how to move on.