Spirituality

When the Qur'an speaks of removing bad feelings in heaven (7:43), it speaks of it for all people in general, not only women. So one can assume that neither men nor women feel bad feelings like resentment or anger or jealousy in heaven.

Jealousy is related to this life because of our restrictions due to our physical bodies and social factors, as well as things such as concerns over lineage, or fear of loss if one's spouse goes to another, but in Paradise, those are no longer considerations since the environment lacks the same restrictions as the material world.

My understanding of verses such as 36:55-57 which talk about spouses enjoying each other's company in Paradise is that it is a general use of the word "azwaj", meaning that human beings in general will be with enjoyable and appropriate partners, not that this is specifically referring to men and their earthly wives.

This is because most human beings have the inclination to unite with another because the human being is incomplete whereas Allah is complete. Therefore in Paradise they would also have the opportunity to unite with others, without the same social or material restrictions that they have here, although of course the greatest pleasure is to be in the presence of Allah.

This is similar to the apparent usage in 4:1 where it speaks of creating the soul and its mate (zawj) in an apparently ungendered fashion, albeit in practice many Muslims, including Yusufali in translation, render this as creating the man and his woman. But the actual language of the Book does not specify this distinction.

So, from this angle, one does not get the sense that specifically a man will be enjoying all the hur al ayns and the woman is bound only to her husband. In fact, that makes no sense because some women marry many times, and some marry no times. Some women also marry men like Yazid who is the last person they would ever see or want to see in Paradise. 

However, inshallah if someone wishes to be reunited with their husband or wife in Paradise, they will be able to do so and enjoy each other's company there. 

In any case, when we discuss the Hereafter, we really just take our best guess based on our understanding and what has been transmitted - none of us can say with entire certainty; what is certain is that we will find out.

It is permissible. 

However, it should not negatively affect people who are financially dependent on you (that is, you should not voluntarily impose poverty on financial dependents such as a wife or children), and you also should not put yourself in a situation where you are financially dependent on people (for instance, taking state benefits by choice).

Also you should not make this into a religious requirement or ideal; rather just say to others and to yourself that it is your preference. 

Basically you can live according to any lifestyle you want, as long as it does not involve anything harmful or forbidden, and as long as you don't require it for others or become arrogant about it.

People have different personal and spiritual needs and perhaps some people do better spiritually with a simple lifestyle. However, it is good to remember that the Prophet (S) was both rich and poor, and his example was of being actively involved in society - including financial aspects - while maintaining spirituality.

Also, there is an advantage to having wealth, if you are able to use it to assist the less fortunate or use it in the performance of religious acts (such as performing the hajj). For instance, Imam Hasan (A) would not have been known for his generosity if he did not have any wealth to give.

Overall, I think it is fair to say that, as an ummah, the Muslim world today is in greater need of overcoming mass poverty, than encouraging voluntary poverty. (Of course this is a complicated issue since one of the main problems in the Muslim world is the unequal distribution and misuse of wealth, not actual lack of wealth, and not all Muslim areas are poor, but it cannot be denied that poverty is a debilitating problem for too many Muslims. This is a social problem not an individual problem, but just putting it out there.) 

That being said, the Prophetic teachings discourage an overfocus on or overindulgence in wealth; rather, they encourage people to follow the path of moderation.

In any case, none of us is the Prophet (S), so we have to make the best decisions for our own lives in the matters which are left to our own choice.