I KNOW you don't want to hear this man. But the ONLY way you are going to show her that you mean business is by leaving her alone.
100% no contact. Picture it. She gets home. House is empty. Keys hit the kitchen counter. She's still alone. She has time to think. She puts food away. Checks the messages, calls her friend back. They talk about the day. She gets off the phone. She's still alone. The Lean Cuisine or Amy's dinner for one is out of the microwave. She's watching TV alone. She's telling herself that she is happy she has this time to herself.
She checks her phone, absolutely sure to find a text or a message from you. Nothing. Hmmmm... that's strange. Back to TV. Dinner's over, and it really wasn't all that good. There's nothing on TV. Checks the emails. Nothing but bullshit chain mail from her mom and aunt. She checks Facebook, certain that you've left her something. Nothing.
So she checks out your profile. Nothing's different. But she still goes through each of your photos... you know, just to make sure. Computer's off. She's bored. She picks up her cell phone and flips through it, looking for someone to call. No one seems like the person she'd really like to talk to.
She'll do that for a week, and trust me man... things will be fine.
But the longer you call her, text her, emails her, write her, stop by, beg, or EVEN see her and smile... YOU ARE FCUKING UP!!!
Walk away. Let her think. Show her that you CAN give her what she needs. Space. She just needs time. She just needs to remember what it was she liked about your dumb ass to begin with.
Grow up. Leave her alone. It'll be fine.