Heaven is supposed to be your perfect place.
Where did you get this idea from? There are many different ideas about heaven, but then there's alot of stuff just made up.
Biblically, other then this wonderful place little is said about heaven. The only thing we know about heaven is that
there are many mansions there and that wives and husbands don't exist.
Budhist believe in Nirvana where you're one witn the universe.
Norse believed in Valhalla where you spent the rest of eternity locked in battle.
Greeks believed in Hades where you just existed for eternity, maybe with some punishment if you did something to make the gods angry.
Jews believed in sheol, a lifeless existence similar to Hades.
What if that perfect place for this individual had you has his slave back in ancient Egypt or whereever and now he wants you in Heaven...when you die to you go to him...if you were dead already; do you lose your own place in heaven?
You're thinking of this as a 20th century person in which everyone is born equal. Egyptians believed the afterworld was just for pharohs and other nobles. Slaves are like cattle or something. They don't have souls.
If you're a noble and you bring your slaves with you to the afterlife, they exist there. If you don't, well slaves are cattle, they don't go to heaven.
On a second topic...many are married and in relationships yet grow to hate their SO...they are civil though and love the stability even a terrible relationship brings. The unknowing SO dies, do they get you back in Heaven?
Which heaven are you talking about? Biblical heaven? Well, I'll let Jesus handle this question.
Mathew 22:23-32
23That same day the Sadducees, who say there is no resurrection, came to him with a question. 24"Teacher," they said, "Moses told us that if a man dies without having children, his brother must marry the widow and have children for him. 25Now there were seven brothers among us. The first one married and died, and since he had no children, he left his wife to his brother. 26The same thing happened to the second and third brother, right on down to the seventh. 27Finally, the woman died. 28Now then, at the resurrection, whose wife will she be of the seven, since all of them were married to her?"
29Jesus replied, "You are in error because you do not know the Scriptures or the power of God. 30At the resurrection people will neither marry nor be given in marriage; they will be like the angels in heaven. 31But about the resurrection of the deadhave you not read what God said to you, 32'I am the God of Abraham, the God of Isaac, and the God of Jacob'[a]? He is not the God of the dead but of the living."