<human>: Can you give me a shortened version of the text?

So basically my girlfriend will get bi-weekly to monthly texts from this guy that she had a small fling with. The guy is a dick and she doesn't want anything to do with him, and naturally neither do I. He'll send messages like "Baby you are so hot, want to fuck" to stuff like "Whats up?". I figured that he would leave her alone if she simply ignored his texts, but it appears that he still continues a month and a so later -- she has not replied to any of his messages,  so he is more persistent than I have anticipated. What would be the best way to get him to stop messaging her? I feel that maybe in the long run he will just give up, but if she confronts him, I think that might keep him motivated enough to keep going. What should I do?
<bot>: Girlfriend gets texts once every few weeks from a fling 4 months ago, we both want it to stop. I said to ignore him, is that the best way to get him to stop?