We are all seperate souls and not attached to one another in Gan Eden. The husband and wife relationship on this earth is a physical partnership despite many having a feeling of deep connection to their spouse. After all, one person can have more than one marriage and people can be gilgilim. Neshomos are seperate and perhaps have contact which each other in the afterlife, but one neshomah doesn’t “serve” another or two neshomos are not bound to each other for eternity. Neshomos ideally bound to Hashem, versus going to gehinom c”v which is the opposite of being bound to Hashem. Again, neshomos go back to their source, which is from Hashem, not to other humans they had in contact with during their physical lives. I remember reading that women have their own Gan Eden. I don’t see why women can’t learn Torah in the afterlife, they are not bound by time-consuming mitzvos at that point.
The main point of Gan Eden is that souls bask in the glory of Hashem and that is non-stop pleasure so perhaps they don’t need to do anything and just BE. “Doing” is only for this world and the next world is for “existing” to bask in Hashem’s glory. At that point emes, which is the Torah and knowledge of Hashem, is not something that needs to be aquired but is simply known.