It is not crime but certainly is adultery. She can sue you in divorce court for adultery. Why not get your dvorce before involving a third party in your life? If you have children it can be an issue in your custody case. You will confuse and hurt your chidren.
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Adultery is a misdemeanor in Illinois, but it is not normally prosecuted, although it can be. If you can get your divorce over with, you should do do quickly before you involve yourself with another person. All your actions may do is enflame issues that could be easily resolved.
Planning to get divorced and in the process seem to be 2 different things. It is an archaic crime but adultery is still a crime in Illinois and if you are spending any money on this new relationship, you could be accused of dissipation of marital assets.. Why are you in such a hurry to get involved again if your marriage is falling apart? Please be discreet and if you have children, do not bring a new person into their lives at this stage.
Don't introduce the significant other (paramour) to your kids until the divorce is finished, if there are any, and you will be fine. What you do on your own free time during a divorce is your business. It is misdemeanor, but i have never seen a single person be prosecuted and such crimes are outdated and archaic.
Please contact a lawyer and do not make legal decision based on the legal advice provided. Criminal cases are complex and factually very sensitive.
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