1. No contact lets you escape desperation.
You might be feeling overwhelmed and desperate after a breakup, like you're bombarded with emotions. You've just lost someone very dear to you, so feeling this way is normal.
No contact works to let you get away from that kind of desperate mindset, which will actually drive him away. Ultimately, you want to get to a point where your ex boyfriend sees you as attractive again. And being desperate won't help that.
2. No contact should be implemented for 30 days typically.
Some people advise more time for no contact periods, but 30 days is a good start. Basically, during this time, you should be avoiding talking to your ex as much as possible, and instead focusing on:
-Your own mental health
-Keeping busy and active
-Doing things at work to keep you distracted
-Making any necessary changes in your life that will help you feel better
-Keeping in touch with friends/support network
3. No contact means as little contact as possible.
While you don't completely have to avoid your ex boyfriend, for example if you see him at work or around town/school and you can't avoid him. But you should be minimizing contact with him. This means not actively texting or messaging him. When you see him out somewhere, simple smile and say hello, then go about your business.
You don't want to send the wrong message, that you're no longer interested; you just want him to know you're keeping your contact as minimal as possible until you can get out of the desperate mindset that will drive him away.
Once your no contact period is over, you will need a plan to get him back. This entails certain steps such as making yourself cheerful and attractive, re-initiating contact with him, sending a special letter to pique his interest, and finally keeping your relationship on track for good.