Thank you both so much for your responses, I have been re-reading them in times where I feel like I need the support.

Aislynn,
I am so sorry that you have had to endure such a horrible relationship however it is really good to know that someone out there is going through some of the same things I am. I really believe the feelings of guilt stem from the person that I am and the values that were instilled in me growing up. I agree with you, eventually the drug abuse and people abuse will catch up to them at some point in their lives and I believe it will be at that moment that they wish us back the most. I am still really working through all the emotions of being apart from someone I loved for so long but I am confident that with time I will be able to really separate myself from him and the relationship. I hope you are doing well , and I hope that you continue to stay strong during this really difficult time. I think about the relationship very deeply and I have decided that I really owe him no explanation, no contact , and no friendship. Even friendship would be a privilege that he would eventually exploit, a privilege that he doesn’t deserve.

I am going to really try to stay strong. What worries me is that I do believe he will continue to try to get into contact with me and I believe his efforts will become more frequent and more aggressive as I continue to ignore him. Anyways. Thanks again for the response !