Long story, so I apologise in advance.
I have been with my husband since I was 15, I'm now 44 and he is 53. Around 4 years in to our marriage (I turned 17 three days before our wedding). We we're in our local pub on New Years Eve, and a friends then girlfriend was showing our daughters photo side by side with her nieces photo telling everyone that my husband is her father. I was young and I lost it, I thought she was saying he had cheated on me. My husband at that time told me he isn't the father and that the woman in question had slept with a lot of men (some of his friends had also been with her around conception). Over the years he has always denied it, but last weekend the other daughter messaged him on facebook, he met up with her a couple of days after and it went really well. He is now telling me that he has always known he is her father, but didn't want to upset me and our daughter. My husband recently started dealing with his mental health, he admitted around 4 years ago that he was turning into his father. Which he was, my daughter had to live and grow up with what he now calls himself the "C" word. My daughter has severe mental health issues, Anorexia Nervosa, OCD, Autism...She is refusing to meet her suspected half sister until they do a paternity test. I 100% agree with her, but my husband is now after meeting her that she is 100% his daughter and doesn't want us to ask her to do a test. I'm so overwhelmed with the situation, its brought all of my insecurities to the surface. I was sexually abused just before I met met my husband and I've not told anyone else but him and my best friend. I know I need to deal with it. My question is how do I help my daughter through this and how do I stop feeling like he's cheated when he hasn't. I don't know what to do