DP's ex wife is very reliant on him. She asks for help with her finances, buying a house, car maintenance, DIY etc. She is always asking him to nip over for some reason. She also wants to discuss her dating life with him. Obviously they spend time in each others company for kids' birthdays and events too which is to be expected. I see my ex occasionally for my sons' events too. But I feel really uncomfortable with the rest. Especially because she seems to hate the very sight of me and has never spoken to me.
They have been divorced for about 3 years and separated for five. I met him a year after they split. She left him for someone else and has since split from that person.