This guy I hooked up with once has called 30 times in half an hour... what is wrong with him and what do I do?

Anonymous
There is this guy I met through a mutual friend a month and half ago. He was nice but I was already with someone kind of, and he immediately booty called me saying he wanted to set it up early. I had seen him out once more but I was with my guy but now me and the guy I was seeing broke up and I reached out to booty call guy for drunk rebound sex (don't judge, I just went through my 1st heartbreak), it was nice and all, we had fun and he left the next day.

He texted me later and the day after (today) and then asked me to out drinking with him and our mutual friend but I stayed in. So he kept insisting to come over later but I said I was tired and had work to do... this guy proceeds to call me, then have our mutual friend call and text me, THEN calls me 30 TIMES and counting in the last 30 minutes even though I haven't answered any of them and I texted him to stop and that I won't answer but he is still calling.

1) HE wanted a booty call originally so what the hell is this.
2) THIS IS LITERALLY CRAZY.

Our mutual friend is one of my good girl friends and i don't want things to be weird plus it would have been nice to have a no feelings thing with limited contact but a once a week to every few weeks booty call but this guy killed it and is on some new level of crazy - remember now I've only seen him in person 3 times.

What is the best way to approach this? I will definitely see him around but I am genuinely freaked out that he would do this. Any advice or insight into this madness would be appreciated.
This guy I hooked up with once has called 30 times in half an hour... what is wrong with him and what do I do?
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