Definitely, all of us has different reason why we wanted to divorce our husband. In other hand it's amazing that when your husband becomes your ex, that's when he wanted to be with you, sex and all. If I were you, I will not let him back into your life. This man has issue when you were still married, he betrayed you for this woman, now that they are living together his also betraying the woman who he pick for a lover.. You need to stop him no matter how much you love him.
Adultery & Concubinage [Art. 333-334]
If you have proof of adultery, you can sue your husband for divorce. In the US, the days of suing a mistress for "alienation of affection" are gone. You cannot obtain a money judgment for emotional damages caused by your husband's infidelity. No judge will order the mistress to pay you.
When a husband wants to keep his family and still have his mistress, then yes, the wife has every right to file for divorce.
If your husband has broken off the affair with the mistress then your husband should do the right thing and pay child support, but that does not mean you have to accept the child into the family. If the mistress does not want the child then it is up to you whether you want to help to raise that child. If your husband is still seeing his mistress then pack his bags and kick him out and either file for a separation or divorce.
Your husband's mistress does not have a contract with you. Rather, she is a citizen who was no doubt told by your husband that he was leaving you. If anyone had a suit, she might have one against him. For that matter, you have one against him, also. A divorce is a civil suit.
Some marriages work out when the ex husband marries his mistress, but often the marriage becomes weak because the ex husband does not have the staying power; maturity or desire to make a marriage work. If the marriage has problems in the years to come (and there will be problems) he may well cheat on the mistress he married just like he did with you. Move on in your own life and let your ex husband find out what he is made of.
A divorce and a restraining order?
A Divorce. He can then pay you alimony and see how much the mistress wants him then. Be strong. If you have some education and decnt health, you can take care of your self.
no because divorce is only for the couple married
Most mistress' do not tell the wife she is cheating with the wife's husband and the only reason for that would be to pour salt into an open wound. Mistress' are losers and will never be at the top of the list in any man's life. He may take her on vacation, dine out, go to the theater, etc., but he will generally go back to his wife or, if she finds out and they divorce the percentage is very low the husband will continue a relationship or marry his mistress.
If you have proof they have cheated then confront your husband (he is mainly to blame because he is an adult and knows better) and tell him that he and your sister in law have a week to tell her husband or you will and if he does not break up the relationship with her then you are filing for divorce. You husband and sister in law have created a situation that has hurt you, her husband, any children they may have, but also hurt the rest family as a whole and cause two brothers to end a possibly good relationship.
Firstly the wife knowing very well her husband has a mistress should not be having a sexual relationship with him and knowing full well he uses the same toys on the wife as the mistress is disrespectful and disgusting. The wife needs to get a spine and stand up to her husband and tell him he gives up the mistress and goes to marriage counseling or he packs his bags; gets out and the wife files for divorce. Considering what the husband is doing he isn't worth keeping anyway.