DH used to have a carer for his elderly mum (His mum lived with him and his then partner. This was around 12 years ago. ) The carer was in most days and DH was always the one who saw her. They got on well and he trusted her implicitly as well as really appreciated what she did for his mum. In many ways, she became family. His partner barely knew her but wasn't wasn't a nice person. I don't know the exact details but I know that in the end, she made the woman feel unappreciated and untrusted so she quit. DH came home one day and was told that the carer had quit. He was sad about it but moved on. Today however he received a long letter from her after all this time. Just saying how it always made her feel sad the way it ended, that she wished she could have said goodbye properly and that she really cared for his mum. Also that she was never the same after all of that happened which I'm not sure what she meant. She is emigrating to Australia and didn't write before as she didn't want to cause any issues.
Am I right to feel a bit weird over this?