If they’re friends, no. Now better question is it if it’s weird that they’re friends and that requires a lot more context. I truly don’t believe that you can’t be friends with exes or people that you loved deeply

9

If the children are also attending then that’s super healthy co parenting. Buy a ticket too!

8

I feel like some info is missing, are they friends? Does the concert involve the kid(s)? Were you invited to the concert or did you not want to go

5

It’s good to remember that they were once attracted enough to each other to 1 date and impregnate/get pregnant and 2 keep and raise the kid(s). It’s different if it’s a co-parenting scenario like everyone else is saying. If they’re alone… I’d be weirded out. Definitely.

2