I think there was an arc in the older comics about how they were in love and wanted to marry, but it was against the laws on Krypton... So they brought in a Supergirl from a different dimension/timeline so Superman could be with her. I believe the og girl went to the other timeline to be with that Superman?
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This could also have been a very special/memorable fever dream from earlier in the week. Not sure rn
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This could also have been a very special/memorable fever dream from earlier in the week. Not sure rn