I am a very social person and for a while there she was too. In the last few months, she has become more and more distant. I remember taking her shopping, to get her out of the house, and she was so happy! Now I can't get her to do much of anything.
It can become increasingly hard to socialise. Depression, anxiety etc feed off themselves, so the less you do, the less you want to do. Also, (for me anyway), when I'm not sociable for a while and have been isolating myself, it's hard to be sociable because I feel that I have lost touch with people, and also that I don't have much to be sociable about, if that makes sense. Currently, I have been off sick from work for about 7 months. During that time there have been a lot of changes at work, especially with the staff. Most of the people from work that I see outside of work are now in different roles, so I'm out of touch. Also the majority of those 7 months, I've spent at home alone. So I don't even feel like I've got much conversation, because I haven't been anywhere or done anything in that time. I will get back to being 'me', and being sociable again, but I know that I will have to take it in baby steps, at my pace.
She has been pushing me away, little by little, and it seems the more that I try to do the less it matters to her.
I too doubt that 'it matters less', but I imagine she is pushing you away, because she can't handle being around you. I'm not being mean to you. This is her issue, and absolutely typical behaviour for someone who has survived abuse and has PTSD. 'We' can appear quite selfish, in my opinion, but that is the 'stress' part. I want to feel someone cares about me, but the moment I feel smothered, I will push them away. And my idea of 'smothered', could just be one phone call at the wrong time.
(Hmm, I'm finding it hard to explain. I will try to come back to this.)