Mine separated early 2001. We kinda knew it was coming, him and mum hadn't been speaking much for ages, they'd been acting like strangers and most nights dad would just be like "I'm going out" and come home at 3am.
Then one night he had some suitcases and just said "I'm moving out, seeya guys" and left. We thought it might be just him being immature again but it was for real, the next time he came back was to collect some more of his stuff. It was all a long story, him and mum had just grown to hate each other and always fought, neither would ever listen to the other and it was really frustrating because listening on you could see a solution to each argument so clearly but they couldn't because mum would just keep harping on something then dad would just kinda laugh and walk off and that would infuriate mum more. Then dad found some other woman towards the end who he started seeing and that's who he moved in with when he left but it didn't last long with her either. I think he has some other woman now.
I never talk to him now. Since the split, I've seen him a couple of times when he collected his stuff, once from a distance outside court when mum took him to court last year because he left mum with heaps of debts in her name that weren't hers and we wanted to secure the house (which we did luckily and sold it which is why we've just moved into somewhere smaller), and I saw him last Christmas because he wanted to take me and my sister out to lunch a couple of days before xmas. I thought that would be really awkward but when he picked us up in his car it felt like no time had passed since 2 years earlier when I'd be sitting in that car going to school. Plus he just made jokes the whole time to avoid awkwardness which was good, and he bought me lots of drinks so I got a bit drunk and played pool.
As far as phone calls go, he calls VERY rarely. Birthdays, Christmas and maybe once every few months between. Last time he called was when he found out Ace Frehley wasn't coming for the Symphony show so he wanted to see if I was alright HAHAHA!
So that's my story.