It's such a pride thing. We have to put up this front and act like everything is okay and act like we are winning this because the other person is upset without me. It's corny, it's stupid, it's a sin for gods sake.
I know you can't help how you feel and seeing her all the time is a constant reminder of it. You feel like being alone makes things worse because all you do is think about her. Are you putting her up on a pedestal and not thinking about things she did wrong? Are you like me and thinking she was your hottest ex and that keeps you in the emotional loop thinking "**** I ****ed up, I will never have a girl as good looking as her again."
This could be an important time to sort things out if you haven't already. Sort out the good and the bad that you did, the good and the bad that she did and seeing it for what it is. You might need help pointing out her flaws, my best friend did that for me when I kept telling him how awesome she was. Logically, based on how you guys were at that time, it wouldn't have worked anyway, no matter how many decisions you could change before your breakup. You wouldn't have really learned anything if you kept seeing each other and this was a good thing in a way: you know now you would never make any mistakes with anybody else that you made with her again. Right?
This is all about you. If you need to be away from this circle of friends to feel better, do so. Do not worry what she thinks or what they think. Do this for you, figure things out, and feel better. It took me 3 months of no contact not seeing my ex to feel better, and I have no idea how I will feel when I actually see her. I've thought so logically about it. My ex was immature and needed to grow up as well, and I don't need her to be happy, even if I want her to be happy. Accepting those two facts have really helped alot with my healing process.
You both needed to be apart to have some serious growth and this was a good thing.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.