their dead daughter is offended? rant

so my fiance cheated on me in September. I didn't realize how much they'd done till like a month later but I decided to stay with him anyways cause I'm giving birth in January. It's super hard to get over cause the girl died in a car wreck (that's how I found out about their relationship) and her ashes get sent to our house and all these fundraisers to remember her. and to be honest I could care less about it and my fiance needs to understand that every time I see that stuff or hear it I get so upset nd it's like it's happening all over again. but anyways last night the girls family messages my fiance saying how I'm offending their dead daughter by posting pictures with MY FIANCE ON Facebook. the nerve of them saying that. all I want is to message them and tell them what really happened between their sweet little daughter and my fiance. I'm honestly in shock they would even do such a thing. but he blocked them and I did too so hopefully it's all over with for now. but god like that was ridiculous. I'm done with my rant haha just had to get it off my chest