One Character, Two Campaigns

Hi all, 

I'm somewhat of a newer DM and i had to take a leave from my Campaign for about a year. during that year one of the PC used the same character information in a different campaign.  We are just getting my campaign going again and one of the other PCs has a bit of an issue with him playing the "same character" in 2 campaigns.  In the other campaign during drawing from the deck of many things that character got sent to an unknown location.  The PC with the issue is now telling me he sees the character as "soulless" cause he is not really here. 

 Different worlds, different universes, the character had different equipment and leveled up in the other campaign but is coming back to my campaign as he was the last day we played.  

What would you do? 

Thank you for your input