Have you ever stayed friends with an ex after breaking up?

Yes and it was one of the worst mistakes I have ever made.

I don't believe in friendship after a relationship. For me when it's over, it's over.

I'm still friends with all my ex's.
Really I do not understand why people stop being friends after a breakup unless the reason for the breakup was something like abuse.
Sometimes people can get along great but find that they just weren't compatable to have a romantic relationship.
If you got along with someone enough to have that then you can and should usually stay friends.
It's illogical to not be friends simply because you couldn't maintain a romantic one.

So far, I've only done that with a guy I wasn't serious with. We dated for a week, it didn't work out, we broke up, still friends. However my 1st boyfriend I dated for almost 5 years. Couldn't ever be friends with that guy

Yep and it feels so good

I have with some, the ones who were better friends than lovers.

No but I was always the dumpee so I didn't want to experience how they are over me and into someone else.

yes, and he is my best friend^^

Sometimes, sometimes not. Really depends on the person. Some are assholes now, others are still nice guys.

Just my ex-girlfriend. All the guys I dated got really weird after the break-up. There is only one I somewhat regret not staying friends with... but then again he got really REALLY weird. It's like my break-ups unleash a dark side or something.

Tried to make the friendship work for her sake more than mine, and so I didn't feel like a complete monster for dumping her. Realised within a week it was going to kill me so I stopped being talking to her. So no, I haven't.

There is only one I would never care to see ever again.

Most of them are acquaintances, two are firm friends.

Fuck no, what use are they to me after it's over.