I don't want my girlfriend hanging out with a guy
Are you kidding? Why don't you want her hanging out with him?
He is a bad influence.
That is your gf's business. You have no right to tell her what to do and who to see.
I want to control her life, she's been trying to control all aspects of my life and I'm sick of it.
It's not right to give in to jealousy and try to control your partner's life. Just talk to her about the situation and let her know how you feel.