SUBREDDIT: r/relationships
TITLE: My girlfriend of 5 years (F21) and I (M20) have a kid together but recently broke up. I can't move on, help?
POST: My now ex and I broke up about three months ago. I was blind sided by the break up and thought everything was fine. The problem is I can't move on. We did everything together for 
5 years and now I feel lost. We have a son together and every time I contact her to see our son, it brings back all the memories. 

I know a lot of advice for breakups is to exercise but her and I were work out partners and every time I go to the gym it reminds me of her.
Anyone been through something similar that can offer advice?
TL;DR: 
gf and I broke up but I come in contact with her every week so I can't get her out of my head