I really don't want to be rude. This is just my opinion of things I've thought of in the past to get me through some hard feelings but....just in case you didn't, you should really measure out whether what you're feeling is love or obsession. Love is willing to let go for the benefit of whom you love, as tough as it may be. Love is being patient with the one you care about. Obsession is more selfish than that. You could have a mix. You could love Dylan, and be obsessed with him for the reasons you love him.
Either way, I don't think cutting yourself is worth it. If you scar easily, you're just making yourself look ugly. Sometimes I look at my scars and regret them. You don't want Dylan to think little of you either. What if he sees your scars and says "Wow, I can't believe I even dated you" That would be crushing. And if you do get over him because you realize that all of this isn't healthy for either of you, do you really want to tell the next person, I did this to myself because I wanted a boy to notice me?!
Don't make cutting a habit. It is actually, in my opinion, a bad addiction. Don't start something so bad that so many people struggle to stop with over this.
There has to be a deeper reason for you doing this. Why do you want Dylan to love you or care about you so much? Why is his love so important to you? Why him? I think you should look into yourself and ask yourself this. It may lead to reasons why you love him but that's not a bad thing.
All in all, be happy that you love/d him, and that he loved you. Never regret and don't do something you may regret, like cutting. Love is beautiful and thank him in your heart for that. When you can, ask him why he became so rudely disconnected from you. Until then, this is seriously gonna suck more than you could ever know, but, be independent. Stand completely on your own and find strength and motivation in things for yourself.
I'm sorry if I said too much. Like I said, just thoughts I've had... Good luck and try and kick the habit now while you still have the strength. It keeps going downhill otherwise. If you need to talk...you can email me. I'm just a person, not a professional. I can be just a friend. I'm here.