Loop does not move on to the next row?

I want two make some operation, and I need to determinate the start and end point! I have two tables and I want to do this :

1. get value (RefName) of the first row from the table 1(Join_Output_12)


2. get the value of POINT_X & POINT_Y as the start points


3. Search for the value in table 2 in field (src_RefName),


4. when the RefName and the src_RefName are the same, select the nbr_RefName


5. look when the nbr_RefName is the same as copy_field, and return POINT_X & POINT_Y


6. then do the same for the next row

For doing this I used three loop for, and I think it's turning right, but it does it just for the first row, and doesn't move to the newt row!

The code is this:

>>> cur = arcpy.UpdateCursor("Join_Output_12")
>>> cur2 = arcpy.UpdateCursor("Join_Output_12")
>>> cur_t = arcpy.UpdateCursor("tb20_12_2014_")
>>> del row2, Refname__table_neighbor, start_x1, start_y1, end_x1, end_y1, copy_field
>>> for row in cur :  
...     Refname_feature = row.getValue("RefName")
...     for row_t in cur_t :
...         Refname__table_target = row_t.getValue("src_RefName")
...         if(Refname__table_target==Refname_feature):
...             start_x1 = row.getValue("POINT_X")
...             start_y1 = row.getValue("POINT_Y")
...             print Refname_feature
...             print start_x1
...             print start_y1
...             Refname__table_neighbor = row_t.getValue("nbr_RefName")
...             print Refname__table_neighbor
...             for row2 in cur2 :
...                 copy_field = row2.getValue("copy_field")
...                 if (copy_field==Refname__table_neighbor):
...                     end_x1 = row2.getValue("POINT_X")
...                     end_y1 = row2.getValue("POINT_Y")
...                     print copy_field
...                     print end_x1
...                     print end_y1
...     row = cur.next()         

The result is:

1
221408.8543
200288.7235
1
1
221408.8543
200288.7235

So I think that the problem comes from for loop!