Dumped out of the blue

My girlfriend of 6 years broke up with me 4 days ago through text. I pushed her to tell me and she blurted out that we'd come to the end of the road, by text. I am completely shell shocked. She's been working extremely hard for the last two months (90/100 hour weeks). She works about an hour and a half away normally but this job was about 3 hours away. She's an engineer who does site work. She is completely run down from all of the work so I kind of figured that's whats been wrong with her for the past week. 2 weeks ago she came home to see me late at night even though she had to be up at 5am. She kissed me all over, smiled and said how much she missed me. So naturally I thought everything was great. When she broke up with me I asked her to try couples counselling or mentioned that it might have to do with the long work hours, she said no way to counselling and the work doesn't help but it's not the problem. She said she's not in love with me anymore and there's no point in going to counselling when it would oly be giving me false hope for 6months or a year, when she knows the end result would still be the same. TBH I'm not sure she knows if she's in love with me or not. We have an amazing friendship and rapport. She wants to meet tomorrow and I really want to see her but I know just how difficult it's going to be. I've kept communication to a minimum (which was extremely hard) until today unfortunately. I just couldn't not talk to her today. She says she's really sad and feels like she's missing a limb. But I know that work is keeping her pretty occupied. I on the other hand am just about to start my online studies next week so I've all the time in the world to be heartbroken and grieve. This really has been completely out of the blue. She's not great with her feelings and sometimes I don't think she knows what she wants. Oh and she's turning 40 in 2 weeks could that have something to do with it? I don't know, I'm so confused and so hurt!