Just going to comment on the niceness. Try not to take that as a good sign, it just causes you to develop expectations. Work on yourself and put the focus on you. There are tons of reasons she could be being nice to you, and you dont know if its a good or bad reason.

My W has been nice to me through most of our sitch and I would always think things were getting better in the back of my mind. It just made things that much harder when I discovered something that indicated it wasn't. The truth was she was so consumed with thoughts of the EA and OM that being nice to me justified her actions in her own head. Or so I would think if I were mindreading.

Regardless, don't take her emotions too seriously one way or another, they can be all over the place. Good reactions could me bad things, and bad reactions could mean good things. The opposite could also be true, you just never know.

Accept what is, let go of what was, and have faith in what will be