sorry to hear about your break up!
Hi, I'm not one for advice. But I am in a similar situation to you, so I hope it helps in some way. I was with my ex boyfriend for 2 years before he decided "we'd grown apart." We are both at the same college with the same friends and yes I see him every day. I know that feeling, when your stomach churns, or when you pretend you don't care but inside you just want to scream. It's been 3 months since the split and although i'm not over him It is getting better. Sometimes we split for a reason. Even if you think 'theyre the one' whether its age, or whatever things do happen for a purpose. At the time it feels like you'd never want to be with anyone else but sometimes you just have to accept that deep down it's best being over. Believe me at first it hurts and it angers you to see them, but with little contact and keeping yourself busy it begins to get alot easier! I hope I have helped. x :)