Darling,
I know you're hurt. I know you've had your heart broken. Again. It's okay. It's going to be okay.
Bleed first. Let it all out. Let all those encaged feelings go. The hurt, the love, the care, the memories; let them all flow out through your tears. Cry it all out. It doesn't matter how long you cry. Or how many days, or weeks, or months, or even years you hurt. As long as you're trying and healing, you will be okay. Eventually. You have to do this on your own.
No you shouldn't involve other people. If you do, you'll only hurt them, too. Even if they're willing, please don't. No more. Don't hurt others anymore. They just want you to be happy again. To find yourself again.
Don't cut them just so you'll know you're not alone. Don't drag them into the hell you're in just because someone pushed you into it. It's not their fault.
But it's your choice to burn and rot in the fire or fly and rise in the sky.
Until you find your wings, don't slash another's just for you to have company. He can still be with you while you go into your metamorphosis stage. And when you're grown, and completely done--with your past, with the hell you're in, with the fire burning you--soar high. Catch up with him. Fly together. Find your own home. And never ever go back to that hell you called home.