Hey! I am bisexual and I have been in your situation even though I am by far younger than you, what you should have done after at the most 5 years is to start moving on tbh.
Using magic to interfere in a relationship might cause you trouble, if you are aware, there are rules a person must follow with magic. There is the 3x3 rule, anything you do will come back to you 3 times, either good or bad.
Let's say you cast a spell for him to be back with you/break up with his current boyfriend...applying the rules, something really bad will happen to you, especially if they were truly in love.
Sh*t happens in life, but what you must do is learn to accept reality and sometimes things just can't go as you want them to, if he still loves you then he'd tell you something, if you truly love him and the feeling is not mutual then you should let him go.
I'm not one to tell you what to do and what not to do, but I advise you not to use a love spell...
If after all this mini-lecture you STILL want to use a spell, then know that an already made spell costs around $4/$6, if you wish to perform the spell yourself then you will find a pretty effective one in this page
To make him love you: http://www.spellsofmagic.com/spells/love_spells/crush_spells/12550/page.html
This one is called Do they love me?:
Your so wished Love spell:
Just remember you need to have full faith in the spells and also that this is not the wisest thing to do, there are also many spells that can help you let go of him, many spells to help you find your soul mate, just think about it. Explore the spells around, there are soem good ones to help give a positive impact in your life instead of a negative one with 'karma'. Again, I am in no place to talk as I do not know you and who knows? Maybe he still loves you...