<Tr> <Td colspan="7"> When Bailey 's son , Tuck , is at Seattle Grace following a bookshelf falling on him , she starts to feel that she might be a bad mother . Tucker and Bailey separate . The return of George 's mother brings Callie and George together once more , and his relationship with Izzie has failed . Izzie and Cristina continue their rivalry , and Izzie later admits to Alex that it is based on jealousy . A healer with `` powers '' at Seattle Grace makes the doctors question science and faith . Meredith discovers Rose and Derek have kissed , which leads to them breaking up . Lexie suffers an allergic reaction after Meredith makes her breakfast . </Td> </Tr>
<Tr> <Td colspan="7"> When Bailey 's son , Tuck , is at Seattle Grace following a bookshelf falling on him , she starts to feel that she might be a bad mother . Tucker and Bailey separate . The return of George 's mother brings Callie and George together once more , and his relationship with Izzie has failed . Izzie and Cristina continue their rivalry , and Izzie later admits to Alex that it is based on jealousy . A healer with `` powers '' at Seattle Grace makes the doctors question science and faith . Meredith discovers Rose and Derek have kissed , which leads to them breaking up . Lexie suffers an allergic reaction after Meredith makes her breakfast . </Td> </Tr>
why do meredith and derek break up in season 4
why do meredith and derek break up in season 4
Rose and Derek have kissed
Rose and Derek have kissed