I feel for you. A similar situation happened to me following the split with my previous girlfriend. I was alright during the summer since she was away at camp, but when the autumn came, I just broke down evertime I saw her. She was also friends with my friends at the time, so that lead to further complications. I ended up pushing my friends away, dropped out of my A-Levels and spending my time between October and Janary as a hikikomori, until I found a job.
Worst three months of my life. And I still had feelings for her. I decided to get her something for her birthday a few months back and try to use the opportunity to apologise to her for being a complete arsehole when I broke down. Turns out she was getting ready for a meal out, so I didn't get the chance. When I called at her place a week later to try and speak to her, her mum said that she didn't want to talk to me.
Maybe I was crazy for trying to think that there was still something in a relationship that ended a year earlier. Despite that, even though I've moved on, my life's turned around, I've got a great bunch of mates now and I'm running the city's anime club, thoughts of her still refuse to leave my mind. Maybe it's because I just didn't get the chance to say what I wanted to say, but it just keeps bugging me on an almost daily basis.
With regards to whether or not you should see her, go for it. Say what you need to say and be done with it. If there's one thing I've learned, it's that it's better to regret something that you've said than regret something you never got to say. Also, keep your friends close. They'll offer you much more support than any woman can.