Is it a bad idea to date an ex who left to try and save me from her mental problems?

I used to date a girl who had mental issues as she called them. I wanted to help at all costs but she never wanted to put me through it. She said that if she ever got better she would want to give us another try. I don't know what to do because she has been getting better rapidly, but at the same time is it a good idea to date an ex?
Is it a bad idea to date an ex who left to try and save me from her mental problems?
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