I don't recommend casting a spell on a specific person, it tends to end badly. Also, if he/she is your ex I'm sure that there is a good reason for that. Perhaps it is better in the long run that your spell isn't working.
On another note, if you haven't learned your basics then you may wish to read over and study them. This could be another reason why your spells aren't working.
I would not be trying to a spell for this simple reason, you are trying with the use of magic to override their free will which is a violation of the rede "an cause no harm, your will be done", I believe that in casting these spells you magically bind that person against his/her will. I can not in good faith and conscience do that. Use communication or any other means to get the message across. There is a reason why they are called ex.
Blessings and peace: