It's easy to get caught up in the roller coaster, isn't it? I don't know what to tell you other than enjoy the good times and accept them for what they are. Have no expectations whatsoever!
I also suffered through depression and didn't realize it at the time. My W always brings it up. All you and I can do is accept our responsibility in the sitch and make the effort to be a better person. I'm sure it was hard on her at times, but, as I told her this weekend, it was her decision to give up on the M, not mine.
You have to have patience, something that was hard for me to grasp. If you are getting along in most aspects, that's better than walking on eggshell all the time. Go with it, enjoy it. Don't pursue and let her know how much you miss ML or the intimate times with her. She knows this, you don't have to remind her. She has to decide. My W is finally at this point and I really don't care what her decision is, you can't live in limbo forever. You also can't decide for her, only how long you can live with things as they are.