Can't stop crying.

So a little over a week ago my boyfriend broke up with me. Said he wasn't happy. He NEVER not once indicated that he wasn't happy. He treated me so well and was so sweet. But then one day, a switch flipped. He didn't cheat. There's no one else. But I'm so alone and completely heartbroken. I can't stop crying and thinking about him. Everything triggers a memory. And I don't want to feel like this anymore. I'm not jumping into bed with anyone else any time soon. I just feel so empty