Okay, if you use a love spell on the person then you'd be FORCING her to love you and black magick is magick that bFORCES people to do something. It's not fair. Also, if she already has a boyfriend then the magick may somehow kill him and force her to love you, so technically you'd be KILLING a person. I've been telling this same message in countless posts so I'll say this as a ending: learn PLENTY about the types and effects of magick before you start it (study for at least a year).
Why do you like this girl?Think about it.Magic can't solve all problems remember.A better way is do a confidence spell and confess your feelings.If she doesn't love you in return then make yourself forget her with a spell.Its the best way.I'm sorry.
First of all...
Yes you can live without her!
*sigh* all that romantic love stuff is a pointless byproduct of natural selection that programs us to continue our human species.
So my advice is this: understand that the feelings you feel toward her are just a strong friendship that has been corrupted be evolution.
If she doesn't want to even be near you, well, then just forget about the whole thing.
I am sorry if I seem harsh, but its for the best.
Good luck. I hope this is helpful.