新手请教，代码中的new为何没有对应的delete

void CMultiTaskDlg::OnNewTask() //对话框上的按钮
{
    //创建新任务
    CThreadParam* pParam = new CThreadParam;
    pParam->pDlg =  this;
    int nCount = m_TaskList.GetItemCount();
   
    int nPos = m_TaskList.InsertItem(nCount, "任务", 0);
    CString szText;
    szText.Format("任务%d", nPos);
    m_TaskList.SetItemText(nPos, 0, szText);
    m_TaskList.SetItemText(nPos, 2, "进行中...");
    pParam->nPos = nPos;
    pParam->hHandle = CreateThread(NULL, 0, TaskProc, pParam, 0, NULL);
    m_HandleList.AddHead(pParam);
}
每次点击按钮，都新调用CThreadParam* pParam = new CThreadParam;为何没有对应的delete