I'm going to break things off with a friend
What did they do? Do you really need to stop talking to them?
He doesn't support me, he's a bad influence and he caused me to not get a job
Is this something that has been talked about before? If not you should talk to him instead of just cutting them out of your life.
I hate the guy
If you really hate them then ultimately it's your decision to break things off with them as it will be healthier to just avoid them and not have a toxic relationship. But to have closure you must first tell them how you feel and why you are ending things with him.