Seeking expert testimony is a sign of strength. A personal relationship with a caring professional is proven clinically effective.
All individuals (with rare exceptions) all into daily routines which are in part formed by our work schedule, and our sleeping and eating habits.
Honeymoons never last forever and we all fall into routines.
It is quite likely that this normal level occurred at the time of your girlfriends toubles and breakup with her former boyfriend.
You did not say what happened to that relationship. It could have been because they were not geting along or because he was abusive.
It could also have occurred because she is afraid of relationships and sabotaged this one and is now doing the same thing.
It also could be because she has a hard breakup and she is afraid of another failure.
She could have abandonment issues from childhood (neglected or abandoned) and that will cause a person to fear abandonment - real or imagined - and consequently to sabotabe the relationship before they are abandoned.
For now, give her plenty of positive support and let her know that you are a secure and safe haven. It seems that you are already an excellent partner, but if her fears are irrational, then you will have a harder time to make her feel secure.
I do recommend one book that could be most helpful:]
This book can help her move beyond her fears of the past.
If she has abandonment issues due to childhood trauma of neglect or abandonment, then she may require some dialectical behavior therapy.
If she says this is the case, she can work on herself with this excellent workbook":
Keep telling her how you feel and keep giving her the support she craves to counter her insecurities. You have a lot going for you that can hold this relationship together through this hard time. Take action, however, while you can.
Elliott, MAE, LPCC, NCC, CCMHC
I shall keep you both in my prayers.