I am so sorry to hear of your pain and struggle for both of you. It is clear that both of you love each other dearly and things have gotten off track due to normal life getting in the way. Since she has asked for some time and space, the best thing you can do is give that to her. I know you may feel that if you give that to her she will just move on, but pushino or asking for more could cause her to fully pull away. She has come back to you before and may come back again if she is able to have this time to clear her head and feel what she feels. You can let her know that you desire to be with her and will do what it takes to make that happen, and if that means space right now, you will honor it.
I understand all of that and yes she is young and hashe not had the life experience you have. Again, let her know what you desire and then remove contact and let her get her stuff together. You will know quickly whether she can or cannot and then make a decision that works best for you.
At 26 she may not yet have the view of too much outside herself...at that age we all are a bit more self absorbed and when you mentioned how she only helped you one evening, it brought that to mind. and that also may be why it is easier for her to move in and out of the relationship with you. Your experiences differ greatly from hers, so I think this time alone can help her to see things differently or it may keep her in her more self focused views. But you get to decide if any of that works for you moving forward. Let me know how else I can support you.
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Thanks so much in advance.