My parter and I have been together over 4 years, we have lived together for 3.5 years. His divorce is still not final and until 5 months ago his ex wouldn’t let me meet his children. They are 15,18 and 21. Once I’d met the two youngest ones we bonded instantly and they now spend a lot of time with us I have a fantastic relationship with them,his eldest is away at university so I’ve only met her twice, the first time she was cold and dismissive to me even though we were all having dinner in my house, I told my partner and said he’d address it. The next time she came over I was throwing a bbq for my BF’s birthday, I decided to forget her previous behaviour and be kind and welcoming. She was so rude to me when I greeted her I felt like I had been slapped, I left the room and shed a tear. She continued like that all afternoon. My BF said he’d address it With her and he hasn’t. Am I wrong to be furious?