deedee23, It's always helpful if you can give us some information.
We don't know if "he" is an ex, a child, or a friend. This matters, because we assign houses differently depending upon your relationship with the quesited (him.) We don't know if this is a missing person question, a break-up, or an Internet-only relationship that suddenly ended.
My best guess is "yes," I think he'll come back. The sun is a co-significator of the 7th house (used for current or former committed relationships.) With Cancer rising, you are ruled by the moon. His ruler is Saturn, co-ruled with the sun and Venus. The moon applies to a sextile with the sun.
With Saturn as the principal 7th house ruler, however, I wonder if you separated under bad terms. If so, would anything truly change if you got back together again?
My one caveat is that if