Glade memory leaks?

["Konstantin P." <ria freelander gmail com>]

Why this causes memory usage increases in htop?

if (connect_build_object != NULL) {
    g_object_unref (G_OBJECT ( connect_build_object ));
    object = NULL;
}
    connect_build_object = gtk_builder_new();

gtk_builder_add_from_file ( connect_build_object, "main_window.ui", NULL );

    gtk_builder_connect_signals ( connect_build_object, NULL );

connect_window = GTK_WIDGET ( gtk_builder_get_object ( connect_build_object, "connec" ) );

    gtk_widget_show ( connect_window );

Where connect_build_object is a global variable.