I just got back with my girlfriend 3 weeks ago, we have spent pretty much being togeather every minute after work, now she has pulled away,
We used to text each other all day long while we were at work, now she had stopped texting and calling me,
Her best friend got us back togather and I kept in touch with her, every time something would go wrong I would call or text her best friend to see if she could find out what was wrong,
Eventually my girlfriend asked her friend not to enterfear, and they agreed, but I didn't get the heads up, so my girlfriend started pulling back and I called her friend and her friend told my girlfriend, what do I do? My girlfriend said she needs time?

You give her time and realize that it's pretty much over for you two. I can't say for sure but from what you wrote, it sounds to me like you are too needy. You may want to tone that back a bit in the future. Women don't like not being able to breathe on their own at all and I suspect that you are seeing this now.

This might be just me but I cannot stand smothering behavior. UGH! Too many people in relationships think you need to be with that person 24/7. I live and work at the same company as my partner. But we both kept our friends and we both do things outside of our relationship. That is very important in a relationship.

If she does leave you permanently, the best thing you can do for yourself is learn from this so these behaviors don't impact your next relationship.

Texting all day, why not work all day and text when you are done, perhaps a fast I love you at lunch or something.
Yes you over did it beg time.

I would say it is over and you just don't realize it yet