DESPERATE HOUSEWIVES - "It Wasn't Meant to Happen" - Karl breaks up with Edie, who has no idea that Susan is now the 'other woman,' Lynette tries to help Ed heat up his sex life, Bree finds out that Peter has another addiction, and Lily's father comes back to claim his daughter, on "Desperate Housewives," SUNDAY, APRIL 30 (9:00-10:00 p.m., ET) on the ABC Television Network. (ABC/RON TOM) FELICITY HUFFMAN, CURRIE GRAHAM