How can I get this guy to quit bugging my girlfriend?

Well my first question here is how did he get her phone number to begin with? Someone had to have given it to him in order for her to be getting text messages from him. Did she give it to him? If so, why did she give it to him? Otherwise, I guess maybe you didn't hit him hard enough LOL I would say go to the police, but they won't really do anything about it...maybe you should hit him again? That is probably what I would do...

Well this is my advice does your Gf phone has number blocking Options? if that is so have that number blocked so that person can't txt her or call her if theres none of this feature talk to your girlfriend in the first place she should not be entertaining such calls anymore or txt like she should not reply anymore then if she does well you also have a problem with your girlfriend and also i suggest you calling that guy and give him a final warning and talk to your girlfriend i think she has issues to cause if that person dont receive reply's then that person won't txt back.