Aww, Preezie, I'm really sorry about the chemo, everything. Dang, do I know you? One of my friends went through a lot of the same... well, she's in Detroit, so she's probably not you, but I feel like I'm talking with my girl here!
Also, sorry for assuming you weren't already doing certain things. You know, now that I think about it, I was in a running/walking group once and met NObody... sigh... (although I joined another one last year and a dude showed some interest... but I'm taken now, d'oh!). And yes, it can be frustrating when you hear about your girl who met her wonderful man at the bus stop or who wasn't thinking about men when she just stumbled upon him...
But you know what? I guess I had to come to terms that everyone's life path is different. While I could wake up tomorrow, go to the drycleaners and meet my husband, I didn't want to depend only on chance, so I made more of an effort. Funny thing is, when I did start actively pursuing this, I did start meeting more men randomly... maybe I was sending out good vibes. A TSA screener who stopped me ended up asking me out, okay?
He was cute too, but he was one of the dudes going through it with an ex-wife, so I had to move on.
Again, sorry about your old relationship. It did sound like everything was going well and your ex sounds like he was a decent guy, just one with drama in his life.
Well... chin up and keep trying. It's better to figure this out now better than at say, 38-40. Keep us posted as well, and I'm pulling for you, for real!!!!
Oh... have you considered online dating?