Concealing and Revealing Peoples Faults

Q: Is it a sin if someone points out a sin that I am doing and I in return point out one of his sins to him? Is there any hadith regarding this?

Q: How to deal with people who lie about you, tarnish your image, hurt you and deprived you of your basic rights. They constantly taunt you and pick faults in you? How to stay firm in faith when you see a liar and deceptive people to be successful in life while truthful and honest ones suffer? 

Is continuously praising oneself and thinking low of others permissible in Islam?

Q: According to the Hanafi madhhab I would like to know how this principle of Husn Al-Zann is implied and what is the term for having a bad opinion or giving a bad opinion on unproven elements or on a simple imagination do these detractors have the right to doubt the intention of a person who clearly expresses the motivation for their action?

Q: What is the shariah perspective about: hating the sin, not the sinner. Is it applicable in all contexts?

Example: When the sinner promotes his sins and believes it to be honourable and that he is entitled to advertise and perpetrate it, is it obligatory to hate such an illegitimate deviant?

Q: Is it permissible for a husband to ask his wife about her past. He even has her facebook account and contacts. He demands answers and becomes very angry. He sais he has to know and there should not be any secrets between a married couple. Is this right?

Q: I would like to know if it is permissible to expose sins if you need help and advice and you are not proud of the sin you're exposing.

Q: I wanted to ask which sin is lesser of the two evils, exposing one's sin or lying? I am asking because if someone asks if you have comitted a sin, is it permissible to lie and say you haven't? Would that be better than exposing your sin? In a situation where you cannot avoid the question?

Q: My question is that telling truth is more important or hiding someones sins (faults)? 

Q: I understand that it is a sin to discuss one's sin with a friend due to it showing a lack of shame. What if I am the one who hasn't committed the sin, but it's my friend that is talking about matters that relates to his sins with me? How should I handle these conversations despite already trying to give da'wah? Do I get sins also for indulging or contributing to this conversation since it might be displeasing to Allah?