In most states, there is no law prohibiting a spouse from living with a new partner during the divorce process. However, it's important to note that such behavior may have an impact on the outcome of the divorce proceedings, especially if the new partner's presence is causing conflict or distress for the other spouse and/or any children involved. In some cases, the new partner may be called to testify in court or provide evidence as part of the divorce proceedings.
It's also worth noting that living with a new partner may impact issues such as spousal support or child custody. If a spouse is living with a new partner and receiving financial support from that partner, the court may take that into consideration when determining the amount of spousal support that is appropriate. Similarly, if the new partner's presence is deemed to be detrimental to the children, the court may limit the amount of custody or visitation time granted to the spouse in question.
In summary, while there is no law prohibiting a spouse from living with a new third party during the divorce process, it's important to consider the potential legal and emotional ramifications of doing so. It's always advisable to consult with a qualified attorney to fully understand your rights and obligations during a divorce proceeding.