I’m nervous

My marriage of a few days just ended. My soon to be ex husband was having an emotional and sexual affair with his ex. I just found out today and I’m crushed. I was going to forgive him if her came clean (yes I’m an idiot) but he lied and things escalated. In-laws and family are mad at me for giving up on the marriage. Yes I could have stayed and talked to him but I’d had enough. I just don’t want to be or feel alone right now. I feel utterly worthless. He apparently told his ex (and denied it) I was a business marriage even though we’d been dating on and off for years. Can you recommend anything to help me? I feel like I’m dying. I’d stay out of love but it’s not healthy. I want to kneel in front of him and his family and apologize even though he cheated. But I promised my best friend that I’d write my feelings out instead of just acting on what I feel or think.