Ex moved out at the new year to a flat 5 mins away. We have two DC.
We message each other throughout the day most days. Send each other amusing stuff we've found online.
We see each other almost every day. Watch telly together one night a week. Go for lunch once a week with toddler while DD is at school.
On our respective child free weekends, we will go to the others for Sunday lunch.
Will be spending xmas together. Went on holiday together this summer.
Neither of us are seeing anyone else. He spends his free time doing his hobbies. I spend mine doing mine.
Does this sound to you like a couple who have properly separated?
The back story is a bit complicated but we were together 14 years, in a city neither of us are from and nowhere near family. The baby years were rough with no family support and I felt lonely and unfulfilled as a SAHM. We became resentful and generally angry with each other. I became convinced there was more to life and that everyone else was having exciting lives (thanks FB 
) and pushed him away. I also had an undiagnosed illness that affected my behaviour/moods hugely and I was quite volatile. That is all sorted now with a proper medication regime and I feel like myself again.
I still love him and have realised that what we had was actually pretty fantastic and think we could make it work. There's no-one I could be more compatible with. He's my best friend and makes me laugh like no-one ever. And I still fancy him.
I've gained a qualification, am working on another one this year and will be able to pursue the career of my dreams when I finish studying next year (and toddler goes to childcare). My mum is now retired and is happy to come here to babysit which would allow us the freedom to do couple things, even to go away for weekends etc.
His lease is up at xmas, should I tell him how I feel?
I feel a strong urge to but am aware/afraid that he might feel totally differently to me. At least I'd know and could start moving on I suppose? Gah.