Why is he ignoring me after breakup?

It depends on the reason of the breakup, of the feelings each of you had after this event, who decided the breakup. Maybe it was too painful for him and he wants to take some distance and heal, maybe he considers the breakup the end of the relationship and considers no use in talking to you as before. You should figure out, first, if you consider to be healthy for you to continue talking or seeing each other after the breakup. In most situations, it wouldn't be advised, if you don't have a serious commitment to repair the relationship. Talking to him would only affect you even more. Take care!

Most guys ignore you after a break up because it's over and his healing process can beginning. Him ignoring you is his way of not falling back.

They may me ignoring you after you have broken us as they may be finding it hard and needing some time to come to terms with what has happend.

He probley wants time to himself he might be feeling bad or sad or mad and he wants to be alone. It is NOT your fault

Most likely because he is trying to move on. Breaking contact is the most efficient way of moving on from a breakup, though not quite the easiest.

some people prefer to become distant from the person they just broke up with. it's not that they hate you. they just need some space, some time to accept what had happened and to get some closure so that he can move on

After a breakup, people tend to need distance to recover from whatever emotions they were experiencing that lead to the breakup. It may be that he felt a lot of negativity towards you that he needs to get past. With time, things may calm down, and you'll be able to communicate with each other, but right now, things are most likely to raw for the communication to be effective.

He's probably ignoring you because he doesn't want to talk to you anymore. Face the facts. You just broke up. Just give it some time.

He is maybe trying to realize what happened and it may be hard to talk to anyone right now heart broken

People need closure after an ending of a relationship. They need time to process, heal or be able to move forward. It is best to cut contacts and all social media etc..when you are trying to move on or forward from a relationship. Its a great time to have self care and take care of feelings so that you don't lead with anything as you move forward.