All you can do is try to do what is best for yourself. Do what it takes to make yourself a better person sometimes when you grow you've got to go it alone. I don't 'hate' anyone that I was once friends with - EVERYONE teaches us something and to be friends in the first place we must have had a lot of fun at one point! BUT when its time to move on - it's time to move on - as with a job, a career, relationship, friendship.
So yes, I still miss and think of them often, No- I do not regret moving on.
It's all a part of life.
I do only try to surround myself now with those that lift me higher - in the heart and mind. That is where it matters most. xox <><