Before the egg collection the clinic will have made them sign forms on which of them, or if it remains both of them will have decision making over any embryos in the event of a split. If they picked both of them and disagree later then I think it has to be settled in mediation/court. (They also make you confirm what should happen if one of you die, as in can the surviving partner use them embryo with someone else. All very morbid but it meant to avoid things getting messy and needle live u ending up in court)If they have broken up what happens with the embryo they have left? Like can she use it? That’s the sad side to it the fact they have that on ice