It does get easier, and though it may not feel like it at the time I promise you it does. I know how you're feeling I was with one of my ex's for three and a half years and one morning I woke up to him being in a awful mood, and eventually he started a argument that ended with him turning around saying it was over... the flat was in his name, his mortgage EVERYTHING and I just had to pack up all of the stuff I had there as I hadn't fully moved everything in yet and go back home.
Waking up the next day was awful, it felt so wrong and the fact he worked two doors down from my work was even worse cos seeing him walk pass was horrible.. it took me a good while to let go and move on, it's been two years since we split and though I've had relationships since then nothing ever worked and I honestly wanted to give up but I've met someone new now and things have been going great for a long time and I also found myself loving someone again and I have to admit, the serious side to the relationship is fairly new it hasn't been long since we both admitted our true feelings and I will admit that it does scare me cos I'm worried of feeling that heartbreak again specially with a lot of things going on and getting in the way lately but I'm trying to put the past behind me and allow myself to be happy and loved again.
It's going to take time, no one can say how long because we're all different but you're not alone. Take each day as it comes, smile when you wanna smile and don't ever feel bad about it just because you think you should be hurting twenty four seven - cos that is what I did, let people be there for you, go out have fun, have a laugh, cry when you wanna cry.