If this person still loved you, then they would be with you, would they not? Do not mistake wanting to remain friends after a breakup for being love. I'm still friends with a couple girls I dated, but they certainly aren't interested in dating me again (not because of myself, but rather due to circumstances, but that's besides the point).
Anyway, what you're requesting is considered highly taboo, and to be frank, it's an abomination. To attempt force an emotion from somebody that they do not genuinely feel is not only a violation of free will, but also nigh on impossible from what I can gather. Now don't get me wrong, spells that help encourage others to express how they truly feel, or help encourage somebody who would be a suitable lover to cross paths with you (meaning you're giving fate a little request to help you out, so to speak) are all well and fine. They are also much more likely to work, form what I know. But to force somebody to love you if they do not originally feel that emotion is a clear violation of free will, which is part of the basic human essence. An on top of that, it is most likely impossible. So I implore you to reevaluate your situation. If you two are no longer in a relationship, then she probably no longer has feelings for you. It's just a part of life. Some relationships last, and others do not. You will know true love when you find it. Just be careful not to confuse it with infatuation.
Also, it may help for you to talk to the person about the matter directly. It will probably help clarify the situation. Just take my advice, and don't be overly insistent, or act obsessive. That will ensure they completely sever ties with you, which I'm guessing you wouldn't want. Just calmly ask about the situation, and for them to clarify their feelings about the matter. As many wise men have said, understanding is key in life.
You have much to learn about love, from the sounds of things, but don't worry. We all experience something like this at some point. Or at least most of us do. If you need somebody to talk to about this issue further, you can feel free to message me. But if you insist on trying to look for a spell to fulfill this purpose, I can assure you that most people here will echo what I've stated already. To attempt to force an emotion on somebody is a horrid crime, and something that should never be done, even if it were possible.