Oh boy , that ' s probably the hardest thing for me . My SO left recently after visiting for a few days and I was crying day in and out for 3 days . I know prior to his visit to mentally prepare for the day he leaves so I ' ll clear out any plans or errands for the next 3 days so I can spend it letting it all out . The last day I went out to a concert with a friend and came home feeling much better and optimistic . Even though I ' m hurt , I know we ' ll pull through and I have a stronger mentality . My advice would be to let it all out . It ' s okay to be in bed and sulk as long as it doesn ' t extend more than a few days . The transition may be hard but you get back into the groove . Talk to your partner and reassure each other . It goes a long way . Good luck !