Depends of the situation, if she wasn't playing with his/her feelings but was honestly confused and didn't want to hurt him/her, she/he's being childish
If she was playing, not caring about the other persons feelings, well, it's not extremely mature, but it's well done.
So what?
It's someone that you've loved, and if there's not any good reason not to have a good relation with them (and just breaking up it's not a good reason) why not?
You don't have to help them, but "it's my ex, fuck him/her"
It's ridiculous
If she was playing, not caring about the other persons feelings, well, it's not extremely mature, but it's well done.
It's someone that you've loved, and if there's not any good reason not to have a good relation with them (and just breaking up it's not a good reason) why not?
You don't have to help them, but "it's my ex, fuck him/her"
It's ridiculous