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Although the decision may not be easy, one person will likely need to leave the house or apartment as soon as possible.  It may not be clear as to who should leave, so have an open and honest discussion about the facts and logistics of the move and who is most suited for it.  Try to stay as objective as you can while you work to decide who will leave. If you are able, consider volunteering to be the one who moves to make the choice easier. Sometimes issues may prevent someone from leaving the house or apartment.  These issues are usually financial in nature.  If this is the case, plan as best you can and work with the other person to make the living situation as comfortable as possible. In order to make the decision final, both parties will need to decide on an exact date that the move-out will happen either by or on.  Setting this date will help keep the process moving and will make the move-out easier.  Decide together which time-frames work best for both of you. Finalize a date that the move-out must happen either on or by. Stick to this date and work to make it happen. Before the move-out date arrives, you will need to make sure that the process is on schedule.  Since you have both agreed upon an exact move-out date, it will help the process of breaking up if both parties stick to this date.  Make sure you have both properly planned for the move-out and that everything is set up to make the process as smooth as can be.  If you are the one moving out you will have to look for a new place to live, locate any roommates if needed, and start planning the packing and moving of your personal items. If your partner is moving-out, make sure that you are able to afford your current place of residence alone or start looking for roommates if you cannot.
Decide who will leave. Set the date. Make the move.