Assuming that Jesus Christ really was resurrected after he died on the cross, where'd he go?

Ok, so I am not religious and honestly I lean heavily toward what I guess you would refer to as agnostic- like I’d probably say I lean toward the atheist side of the coin, but mostly I just feel it’s beyond our ability to say anything with certainty.

I am just curious whether, according to christianity, Jesus died and then came back only to later [a] die again (and if so when and how?) or [b] if he came back and then just sort of disappeared after while (in which case, approximately when and are there any theories/rumors or indication as to why he left or where he went. I’ve heard a lot about the resurrection and some about when He might return. But I’ve never heard anything about what happened in between. Ok, this is my first question, so thanks in advance to all who weigh in. Cheers.