They are literally the nicest person I've ever met. They promised to never leave and they're super patient and I have no reason not to believe them, yet I just can't accept its true. I know it will end in immense suffering because there's no way we are going to end up together and that's all I want in life at this moment. It's been a week and they are already controlling most of my thoughts. I love the happy moments but the lows feel like hell. I had the same FP for years and I don't know how to handle it when it's a different person I don't know as well. Does anyone have tips? 
Also this is my first post here so sorry if I did something wrong.