I get along with all my exes. I no longer hate them, I actually realized I love them still in small ways. (OK I HAD 2)
My first love made me a video of our son, (for Easter) when he was age 1 through 12, with pictures of his 2nd wife all over, and no I didnt care. I was so touched to see my big baby, now 35 when he was 1,2,3 etc. And several clips of Las Vegas, with his then new wife, and all I saw was the cars! Wow, cool cars!!!
And then I saw videos of me, and I still look the same

I remember graduation parties, with all the exes and their wives there, and we had a blast. And I still see them all the time as just coz your kids grow up, doesnt mean you no longer have to deal with the ex.