My ex-girlfriend still wants to be friends with me?

First off man, you have to cut ties... This doesn't have to be permanent, but you need to give yourself time to get over her. That will never happen if you are seeing her all the time. Time heals "most" wounds. Give it time. Eventually you may find that you can be in a casual friend relationship. But right now, that isn't what you want. And you will not be happy being friends with her now. Give yourself time to grieve and then maybe 6 weeks, 6 months or possibly 6 years down the road you will be able to be friends with her without reverting back to previous feelings. You will likely always have feelings for her, you just need time to understand what the feelings are, and what they should be.