Last time I checked there was no rule as to when someone could start dating again after a breakup. Yeah, I get it, sometimes it seems a little harsh to be dating so soon after a breakup, but in reality it does not matter. The heart wants what the heart wants.
After a breakup, everyone automatically assumes that you are totally heartbroken, or that you need months to recover from the mess that you went through. Sometimes that is the case, but remember no one is the same.
If you know someone that starts dating shortly after a breakup, let them. It is totally OK. They may need it just as a "rebound", or they may be ready to move on, and get back out there. Let them do them. Some people bounce back way quicker than others, and if that is the case, just smile and say "I'm happy for you."
There is no need to judge someone for moving on so quickly. We are all learning as we go on through life. Someone that we thought we were so in love with, and could spend the rest of our lives with could turn out to be the wrong person for you. It could have taken that nasty breakup for you to realize it.
One of the most annoying things is to hear someone say "Oh, they moved on quickly." Yeah, so what!? He/she did move on quickly. They know what they want in life. They know is going to make them happy, and for the moment they have found that.
If you think about, there really is not a way to move on "quickly." Some people just refuse to be hung up on one person for months after a breakup. That is OK! Everything happens for a reason.
No one except you has the right to say that you are not ready to be dating again. Only you can tell yourself no. You know the key to making yourself happy, do not let others dictate that.
There is no time stamp on love, and there is no need to tell others that there is. Again, everyone is different. Let that person be happy. If going out with their new significant other is what it takes to make them happy then so be it.
You have met the next person in your life that is bringing you joy, and you are enjoying every moment of it. Do not let someones ignorant comments ruin that for you. You have met the next person that you see a bright future with, and right now everything is great. It may not end like that, but for now it makes you happy, so let it.
There is no time stamp to allow yourself to find a great friendship in someone. There is no time stamp to allow someone to make you happy.
Happiness is all that matters, and there is no time stamp on happiness.