Sit down with her at some moment when the 2 of you are getting along, and ask her how she feels about the pace of the relationship. Would she like to move faster, slower, forwards, backwards? She will probably reverse the question. That's when you tell her how special she is to you, what she's meant to you at the best of times, and that you would like to take a step backwards.

Do NOT have this discussion when either of you is in a bad mood. Also, consider the possibility that couples normally become less attracted over time, usually a few years or several years worth of time, I think. Yes, married couples spice it up, but sometimes no amount of spice will do. It may just turn into more of a friendship/family mature relationship... Anyone, feel free to comment on this last part. I'm not 100% sure of this, but have heard it many times.

If you do end up spending some time apart and get together again later, that would be one of many opportunities to discuss the other problems. The expression, "hindsight is 20/20," suggests that after a break both of you might see things more clearly, have cooled off any anger, and be ready to listen well and move forward constructively.