It's not mandatory more of a gesture to say you value your friend.
Well, it depends on how the relationship ends, who ended the relationship, why you're dating you're ex's bestie, and how long it's been since the relationship ended. If you're dating the best friend only to make the ex jealous. Like if you're using the best friend to play mind games.
That it not acceptable. It's a bit of a tricky scenario with a lot of ways things can end badly.
How to Date Your Ex-Boyfriend’s Best Friend
If it happens naturally and your real friends everybody involve would understand my humble opinion. If he was a horrible human which I'm sure she'd be aware of if my friend I may suggest she rethink her choices otherwise date away.
Glad they've both got great taste in people they want to spend time with. There's bigger fish to fry in the world.
Date Her Friend
I'd appreciate it if I was asked. My ex said she didn't have feelings for me anymore, and ended up, a month or two later, dating a friend I had introduced her to.
After that, she wouldn't even talk to me, and more or less isolated me from that whole friend group. I know that they're happy now, and I'm glad, they're both good people, but things like that can really sting, and I'd want to be able to feel happy for them, without having to have that pain.
You’re Probably Being Microcheated On
Honestly, yes, as long as your ex's friend and you haven't been having relations in the friendship or are being used to get back at your ex. You really can't help who you fall for. And shouldn't have to say no simply because of the fact they're your ex's friend. Normally, there are only a two people you ever have to consider when you start dating someone new: Who cares about what other people think? This is usually solved by being up front with both your ex and their friend and asking.
But friendships are complicated. You loved or at least liked your ex, so it makes sense that you vibe with their friends.
But sometimes the best thing you can do after a break up is to totally switch things up. Dating new people can be dreadfully hard, we get it, but branching out is a good thing. Their social proximity, dreamy eyes, and the ease of already having access to the Instagram profile aside, why this person?