I think it takes an enormous amount of energy to maintain any relationship and sometimes people don't have enough and have to "cut back" whether they want to or not. I don't have any problem with someone saying it is they who have a problem with maintaining the relationship but no matter what they say, it is how you feel that is all that matters. It can be a loss to her, doesn't matter if that is true or a lie as you can only deal with/"care" how you feel, not how she feels. If she's ending the relationship (or taking a break or whatever) then she's ending it; not anything you can "do" about that in any event. Take care of yourself, it is the only person you are "allowed" to take care of.