I haven't spoken to my father in months. Long story short, my parents divorced over 25 years ago. He now lives with a woman who has done nothing but cause chaos and drama for 8 years, including speaking ill of our mother to me and my siblings, thinking we would side with her (we won't, ever). He had left her last fall, but because he refuses to take care of himself, he went back to her a month later and now my siblings and I are estranged from him. He found out through the grapevine that I was getting married before I could tell him (he's never properly met my fiancé). I'd been working out how to do so in therapy sessions, but before I could, I got blasted with nasty texts from his girlfriend about how hurt he was, before he sent me a nasty text to which I didn't respond. Anyone have any words of advice on how to deal with this? I really want zero to do with him if she is in the picture, but I don't know how to tell him that he's not invited without inviting drama.