First thing to do is to try mundane ways of getting your old mate back. If you really feel someone placed a spell on him, you can try something for clarity. I'd probably stay away from trying to cast on him though.
Casting a spell on him I agree you should consider being a last resort at most.
Something to know now is that you can't force a person to do something they would otherwise be completely and unquestionably against, even with magic. Maybe it's time you look at where your life is heading. Sometimes change is needed to get to the next step. So instead of looking for a quick fix by asking someone you don't even know to fix your relationship issues you should take this situation firmly in your own grip. I assure you, if it's meant to be you'll certainly be able to get him back without such shady and unpredictable measures (i.e. asking someone you don't know to fix your problems).
You need to be strong now and think carefully. Assess where you and your previous love stand. Speak to him about it and work from there using logic and reasoning. Remember to stay calm as well, capping your way through a website forum won't fix any of your problems.
Love alone is not enough to make a relationship work!!
Everyone got that?
Sappy love movies and Disney films love to feed us this idea that love will conquer all and everything will be just fine so long as you two love each other. Like a lot of lessons in Disney films, it's dangerously stupid. You don't just love in a relationship, you share interests, you communicate, you generally live together.
What if you and your magically-kept lover hate one another's hobbies and can't share them? What if you two have some sort of communication barrier? What if they hate your sense of humor? What if they snore so loud it keeps you up? What if they're allergic to your favorite animal? What if they're controlling and need to lord over the relationship?.
The cage element comes in because a lot of people are in similar situations, but can't bring themselves to break up because they are too in love! Think about that. They are so in love that they are trapped in something making them sad, something unhealthy, and occasionally something that is actually abusive.
Love magick cast on a specific person can make them feel love, but it cannot force you two to be a good match; and it can force a relationship, but it cannot force any sort of quality upon it.