Am I happy? (Sequal to 'The girl') -=+=Gaster!Sans X Reader=+=- [DISCONTINUED]

Are you truly happy? You are newly engaged to G, but he starts changing a week later. Your worried about him. He sneaks out and night and just doesn't treat you the same way anymore. But one night, but you soon regret it. They say forgive and forget. But how can you forget.. what you saw saw and how can you forgive?