break ups

So my boyfriend and I just broke up after dating for a year and a half. He just said he wasn't happy anymore and that when he went home after dates he felt heavy. He didn't want to be with me anymore and now it's only been a day but I can barely breathe it feels like I won't survive. I've never been through a big break up before and I don't know how long to wait before getting rid of things and do I delete him off Facebook?