I'm not trying to sound insensitive, I've been there, I know the feeling, but, I would like to point out another life lesson that you can learn from this. Remember the feeling of being broken up with but still having to be around the guy, that is the reason that later in life, you should avoid having a romantic relationship with someone you work closely with. If the relationship goes sideways, you don't want to have to spend a lot of time with that person at work.
I really hope that you start feeling better soon, I know seeing him daily is just making it worse, but, you will get through it, and please stay single for a while, don't just attach yourself to the next guy that smiles at you, that is rarely a good idea. Take some time to get to know yourself again. You have been "Ronnie's GF" for the last 2 years, now you need to find out exactly who YOU are without him.