Hang in there, I understand how you feel, how can you trust again? Like Gabriel I also saw some positives in your H's actions.
He asked about your book. (shows some concern about what you are doing)
He didn't get angry and wants to put the past in the past. (we can't unscramble eggs, so we have to put the past away to start a better future)
He asked to drive you to college. (Means he wants to do something for you and be with you)
I know alot of things cause us to worry, (the "ghosts of the past"). During the D process, W said many mean things to me and I said bad things to her, so if we are to start a new relationship we have to let go of the past. Letting go of the truamatic events of the past can be very difficult, but very rewarding if we can let go.
Keep busy while you are alone and use the time to rebuild your PMA. Maybe get out of the house to do something that would be fun and relaxing that would not be possible if your dd was with you. Go ahead and do something for yourself, its ok to be a little selfish.