I mean absolutely no offense when I say this, but move on.
If you want to do a spell to cause him to come back, it will take a lot of work and energy on your part. You get what you put out. If you bother with something easy then you are not putting energy into it, and it will be less likely to work.
The idea that someone would want to drag someone out of a relationship disgusts me. Just had a psychotic fifteen year old try to do that with me and my fiancee. When I found out he was trying to get me to leave him, it made me hate the kid. Do you really want that with someone you have feelings for?
I am guessing the answer is no. So I would at least hope if you are going to bother with forcing someone into your life that obviously does not want to, you would at least put forth effort rather than going the "easy route"