Is it ok for your best friend do date your ex?

I'd feel really weird about it, to tell you the truth. But if my best friend approached me beforehand and if they seem to really like ecah other or have some sort of connection, then I guess I'd learn to deal with it.

it doesn't matter to me. only immature people react negatively.

I know this is a very tabu thing to do and most people think it is wrong but I really think it depends on how mature all the people involved are. I am bias with my answer though since I am now married to one of my friends first love. My best friend also dated my husband before we got together. We are all still friends. Also my husband's best friend is my first love. I think we all are pretty mature and we all realize that in the end everything worked out the way it should have. I think that when love is concerned it is hard to fight it off and just because society says that you shouldn't do it, doesn't mean that your heart will listen.

Personally that's not OK! for me it's not acceptable.