It is obvious he is dedicating most of his energy/attention on his job with little to spare for the relationship. He is involved so much on the job he felt he couldn't keep up with the relationship.
It appears you demanded so much attention, he couldn't continue with the relationship. When you begged after he broke up with you, it got into his nerves. I know the situation isn't good.
You have to concentrate on your life and move on. If you beg again you will worsen the situation.
It's better to apologize for your neediness through text, and thank him for the short time you had and wish him well. Let him know you love him and if you can't solve it, it's okay. But,you wish it was the case. If he replies or doesn't, move on.
He can't leave his job for you or dedicate more time on the relationship than his job. This is obvious.
If you were meant that be together, you will know when you have moved on. When you have recovered from the relationship.