Hi jinxy
No one can really say why you feel like you do...there are so many factors that go into our feelings that to pinpoint it down to one or two reasons is virtually impossible...the fact you left the relationship shows me that it is best for both of you...sometimes separation clears the mind...if you and her get back together it will be because you both want it...not because you feel sorry for her or she feels sorry for herself...
separation does not mean the relationship will end or never get back together...it's just taking a break to sort out how you feel...and only you can determine how you really feel.
I would advise that you call her...let her know you haven't abandoned her ( because it sounds like you do care )...as a friend...the relationship, if any, will come around, or not, on it's own.
Onanother note...
Glad to see you back posting!
Peace,
Eg ;)