Do not hide. You'll only make yourself feel more worse. He in fact chose his addiction over you. And yes, that fucking sucks. But you dodge a bullet here. If you shut yourself away, then she wins on another level that she didn't even know existed. Do not take him back. If he wants to finally talk to you, you DO NOT OWE HIM ANY OF YOUR TIME. Because he couldn't even be decent enough to spare a few moments of his to give you a shitty break up excuse. I'm hoping for better days for you!