I was 18 and he was 21 when we first met. I had an eating disorder for two years before I met my ex-boyfriend. He started to date me not knowing of my disorder. To make a long story short, I stopped with no help but my own. My self-esteem was low, having a new boyfriend felt right.

Smoking pot became our thing. He just started and I was two years deep. I socially smoked 1-3 times a week. He enjoyed doing it every morning and night.
I moved in with my boyfriend after two years of dating. Moved away from home, went to a new school, had to make new friends.
His and my pot habit became hourly for almost another two years. When we lived together he grew the drug. I couldn't have anyone over because of the privacy issue. It was our thing, as I stated before.
I lost friends and gained potheaded ones. Whoopee. I liked it but I come from I tight traditional family and became distant and too unresponsive.
Six months ago, I started a new job and it became known to me that I enjoyed getting out of the house to speak with people! I've been isolated from everyone for so long.
One day, we both talked and cried after sharing that we were both missing something in our lives. For me it has been my intellect put aside in the clouds if you ask me.
A week later, I snapped got upset and packed my things-I didn't have furniture to call my own other than a mirror. I was without a job and apartment in the city within hours thanks to my loving parents.
Now, my issue is I left without really talking the ending of the relationship through with my ex. I left him with quite an empty apartment and our loving friendship cut into two.
I am more mad at myself for smoking pot so much every day. My words splur out quicker than I can interpret my thoughts half the time and my school work is lacking due to no dedication.
I apply for a program in January and I have 6 months to finish two classes along w working again part-time to pay for a new place with new people.
I'm nervous. I've never been by myself outside of my hometown other than with a guy a used to trust.
I've spent the last month with family and a few days with friends.
Any advice?

You say your issue is that you didn't talk to your ex about abruptly leaving him. So why can't you now? And what does 'a guy I used to trust' mean, after just saying you cut your loving friendship in two? Something sounds like it's missing in this story.

Thinking about that statement. I can't say he has ever lied nor cheated so my usage of "used to trust" refers to nothing. If he did lie or cheat I would have not of known because he was so vague.
As for our loving friendship, we always wanted to touch one another.
It's hard to talk with him because he knows I'm weak. My family and him never got along until recently my mom has been more inviting. He knows my family influences my plan in life. When I told my mom I smoked pot she only could look down with disappointment. She said it was the best decision to leave that environment.

You did a good thing for yourself. The thing now is keep moving forward, and don't look back and have no regrets. You were young, exploring, and experimenting, you made mistakes, as do we all.

Just keep moving forward, and take one day at a time, baby steps if you need to. It will come together and you will make new memories and experiences, to replace the old ones. Leaving the old and embracing the new makes us sad for sure, but it will fade with time.

Good luck.

Thank you Taliniman, for the encouraging words.