Have only skim-read the 2nd page so apologies if I am missing anything crucial. OP, you asked how to do it i.e go no contact.
I am currently 2 months in to no contact with someone who in many ways was like your love interest. Deep seated issues (requiring years of therapy which is only falteringly starting now) that prevented emotional intimacy/a relationship, even though we did love each other in a way. Well, I loved them, friends have told me repeatedly no-one could love me and then treat me that way so perhaps it wasn't love on their side.
The things that have kept me going where I would have failed before were friends, getting support from people where before I was quite lonely and didn't know many people. I have made a real effort to deepen existing friendships and make new ones and this has paid off because it means the love interest isn't my only source of support.
Also blogging about it and reading the Baggage Reclaim website obsessively. Writing out thoughts instead of ranting AT the person in question has helped enormously. Looking back at previous posts to see how your attitudes have changed over time and how far you have come. Noting down things you don't like them as the scales start to slip and you remember shitty things they did to you. Affirming what you want in the future and noting how the past relationship didn't support that and never will - essentially, using writing as a tool for letting go of denial and for letting go of the person, to stop it all sloshing round in your head.
The man before my most recent ex went no contact on me very unexpectedly. It was hell. It's almost a year since he suddenly disappeared on me and I'm over him, I rarely think about him anymore although that's probably because I replaced the relationship with an equally toxic co-dependant dynamic with someone else!
Advice from friends that has helped; see them as a drug and you have to come off them. Only when you have obtained the necessary perspective through a complete lack of contact can you even judge the situation honestly because you are clouded with drugged-up-ness at the moment, with them as the drug of choice. Also cold-turkey isn't supposed or expected to be fun, quick or easy so seeing it in this light makes it easier to be realistic about what you are in for. i.e the first few days are like torture, the first week is hell, the first 2 weeks are hard, after the first month you turn a little corner but be prepared to relapse emotionally and crave them, don't think that means you should contact them, also don't think relapses mean you have failed or are back to square one.
I have learned that grief is a strange beast and it isn't linear. It weaves and wanders and retraces upon itself and that's okay. Essentially you need a commitment to you to believe that all the sadness and pain is worth it, and to do that (because it does take so much self discipline) you have to see that they are causing you pain and will cause you pain forever unless you get out now and endure a short burst of misery in order to achieve long term happiness. You have to see the long view.
Take care and PM me anytime. Do check out Baggage reclaim, she has a No Contact email that is free and supports you through the first months of NC.