Dating during marital separation
Also, the relationship have begun prior to the married couple's separation.
Though alienation of affection and criminal conversation suits are not very common, they do exist.
Further, your new partner may be subject to legal action as well, especially if your relationship began before separation.
In some states, the spurned spouse can sue for "alienation of affection." An alienation of affection suit is when a spouse who was cheated on sues a third party essentially for stealing the other spouse and breaking up the marriage.
The cheating spouse and the third party do not necessarily even have to have a sexual relationship – in some places, a family member who convinces one spouse to leave the other might be liable for alienation of affection (though this is very uncommon).