I met him last year he is my step mom's cousin so we liked each other the moment we meet...so we started dating without anyone knowing so we decided to tell everyone on my side everyone accepted but on his part his sister refused and they have much influence on...he battled to came up with a decision for a month he assured me that he was going to fight for me but with after some time he called to tell me that its best we part ways that it will not be good if he doesn't have support from his sisters bla bla
Try communication before doing anything magickwise. A spell will not force him to come back or manipulate him under your will. I disagree that belief is the only thing you need for a successful spell, you should know all the basics and have practiced them well before you try casting anything. You will probably not find an experienced user that will help you cast a spell and I say that they are better written and casted yourself, however as I said a spell will not force him into a relationship with you. You can try casting a spell on his sisters called the honey jar spell that will help sweeten them towards you.
Ask yourself first whether you truly want someone back who is so weak he allows others to make his decisions for him. If he isn't willing to fight to be with you rather than bowing to the will of his sister, will he ever be able to stand up to anything else that threatens your relationship?
As for love spells, it is important to understand that a spell will not make someone love you. It might draw him back for a bit and it might help create the possibility of love developing between the two of you. But eventually the spell will fade and if you haven't been able to build a strong relationship between you through caring, communication, and a desire to remain together, the relationship will still fail. Better by far to find a love that develops naturally and not force someone's affections that doesn't really care about you.