What do I do if you love a girl that doesn't want to speak with me ever again?
of course we'll assume here that there was a falling out and she got very mad. Perhaps she is right not to speak to you again? If that is the case then you have loved and lost so time to lick your wounds and move on. When we are asked to leave someone alone you do just that. If she finds it in her heart to forgive then she'll contact you.
well first you gotta find out why she doesn't want to speak to you anymore... if she askes you to leave her alone, apoligize and give her her space until she comes around.. and if that doesn't happen just keep apologizing but first find out what you did and she didn't like?
If she has asked you to leave her alone, you have to. Otherwise you might be on the wrong end of a restraining order.