What does it mean if an ex wants to support you through troubled times?

My ex said she has my back , and said she is going to support me through this hell I am going though , She wants to be back with me but she has burned me to many times to the point I can’t really trust her anymore , so do I let her support me and give her another chance? She is the only one there for me at this time?
What does it mean if an ex wants to support you through troubled times?
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