If you've gotten dumped, you can start dating immediately as well, but for different reasons.
Since the breakup we had zero contact and in this time I have become friends with another guy.
It's probably (read: definitely) unhealthy to slap the proverbial band-aid over the wound so soon, but it's so nice to bask in the attention of dudes after being kicked to the curb by one.
I jump on Tinder or whatever pretty much immediately after to fill the void." – Amanda "I waited two months out of respect for the relationship because I didn't want to hurt him any more than I had." – Lee "Fuck his feelings.
A real relationship will require time (about as long as you and your ex were together).
So you just dumped your boyfriend after two years together but truth be told, you've been over it for a while and you're ready to get back in the game. Well, if he sees it that means he's on the app too and as for his friends, they can mind their own damn business.