First of all, congratulations for your improvement. It means you did a good job and that you are a strong person.
I can understand your fears to give a step backwards in your recovering.
I can tell you for sure, that you will live bad moments in the future but you won't be the same and you have learnt how to manage bad moments in the right way.
Life is this, bad and good moments.

Regarding this guy you like, avoiding him bc you could fail or you could be hurt. That sounds familiar to me.
Perhaps, you need a little moré time before going through a relationship.
Talking with the school counselor seems a good idea. I didn't push you until you'd feel you were ready though.

Good luck!