Mac, what a bummer. That's a painful situation to deal with even if it was your decision.
Three years ago I went through a difficult breakup that rocked many of the plans and foundations of my life because I had put all these plans into place around the relationship, and they all kind of fell apart.
After the breakup happened, I had a very helpful and kind conversation with a family friend. I can't do justice to exactly what she said, but essentially she shared a story with me where her family had decided to make a very major life change, and a year after they put the plans into motion, they all decided that it was a huge mistake. She said that after a while, rather than thinking of their original plan as a failure, she started to think about the rest of their lives from that point onward as a clean slate.
Somehow it was just the thing I needed to hear. It took me several months to internalize that advice and get my life in gear, but I decided that I needed to think about the breakup not as a tragic ending, but as an opportunity to start over and do something new.
However, I fully believe that it's okay to grieve a bit over the end of an important relationship, too. Be patient and gentle with yourself, okay?