So my ex keeps calling me to hang out. The thing is I want absolutely nothing to do with him since the reason we broke up is I found out he has a long term girlfriend who goes to school across the country- I found this out when he decided to give her my phone number so she could rip me a new one. He keeps texting/calling me and I keep telling him I don't want to hang out or speak with him at all and to leave me be but he keeps making plans with me without really asking me ("Hey, we're gonna grab lunch on Friday.") and then getting pissed when I don't show up.
So since this guy clearly doesn't get the hint would it be too harsh of me to tell his girlfriend that he wont stop harassing me?