12 year old step daughter hates me
Fiance and I have been together for going on 6 years. Children 12 (girl) and 14 (boy). I had great realtionships with both until about 1 1/2 years ago. Relationship fell apart with fsd. Relationship with fss is still great. There has been no improvment despite anything I try. She absolutely wants nothing to do with me. Won't walk to me, ignores me and in general hates me being around. She only speaks to me if I speak to her first. Sometimes she flat out ignores me. I do not know what to do. I know I should not take things personal, but there are times I just am not strong enough not to. FH thinks I need to be the bigger person as the adult and give her time and space. He basically doesn't want to deal with the issue and hopes it goes away. His lack of care for my feelings and helping is starting to affect our relationship and I don't want that.
Need help! Any advice would be gratly appreciated.