Girlfriend's Ex-Boyfriend keeps harassing her. What do I do?

AppleCrumbDeeznutz
I care about my girlfriend a lot and I hate to see her upset. Her ex keeps texting her explicit messages and won't stop playing mind games with her. He also showed up at her college uninvited on Valentine's Day. He's been harassing her since August (7 months of harassment)

I told her to ignore him and she listened to me. However, this situation could go one of two ways:

1) gets angry and turns into a stalker

2) He gets the hint and moves on

If he already showed up at her school uninvited. Should I assume that he may be a danger to her or me?

Also, after my girlfriend ignored his messages. He started texting one of her friends and asked her why she ignored his messages?

What should I do as a supportive boyfriend? Call the police?
Girlfriend's Ex-Boyfriend keeps harassing her. What do I do?
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