This is the first time I'm going through a seperation but I know I deserve it. I cheated 3 times with the same person. The third time was because I was threatened and scared of photos being leaked to my husband, but by the time I stood up for myself to the other guy when me and my husband were working things out it was to late, the pictures was leaked when the other guy got upset and that's when my husband told me to move out. We're both hurting and as much as I was trying to stop it and do the right thing it just was to late. I hate everything I put him through he deserves more than the world because he loved me unconditionally and I just was selfish. Im trying to cope with everything I did, my mental health is getting worse, I cut myself because I couldn't take the pain I caused him, and I haven't been eating or sleeping. I Miss him so much and what's worse is our anniversary is tomorrow. I'm happy he has support for everything but right now I don't have anyone to talk to I don't know how to live without him or what I did to him. I blocked the other guy the day I left. Me and my husband...ex husband still love eachother but I caused to much pain I pray that one day I'll be able to show him how much he truly means to me. But I don't feel i deserve it, I'm just looking for advice on how to move forward and become a better person.

Honestly, you might want to find a therapist who can help you sort this all out. Figure out why you felt the need to go outside your marriage. How to not hurt yourself anymore. If you feel like doing that again call a crisis line. You are here for a reason.

Does you have children

Stop self harming. See a therapist.
I have a ton of regret for how I treated my husband during our marriage. I didn't cheat on him, but I was pretty unaffectionate, unloving and unsupportive so now that he has begun our separation by moving out and "dating" other women, I'm left sitting here in our house with so much regret, newly found love for him (don't know what you got til it's gone), loneliness and depression and it is overwhelming.
I started seeing a counselor and it's helping a little, really journaling all of my feelings gets it out for a short time and I've gotten on an anti depressant just lately. I don't have much advice on how to move forward because I haven't been able to do that yet either, but self reflecting on your issues and what you need to change about you, making the best amends that you can to your spouse, unselfishly has helped me feel that I'm becoming a better person. Too late for my relationship though. I, like you have a tiny support network of my family, but no real friends to help me. I was always a loner and like it that way until now. Find a support group for separation/divorce in your area. I start one this week. Good luck

You need to speak to a therapist immediately. You need a safe outlet. People make mistakes, mistakes have consequences but you need to face them and start rebuilding your life. A therapist can help you. Also antidepressants