EX Won't LEAVE ME ALONE!!!

WHY DOES MY EX KEEP CALLING ME? Boys are so stupid..... If you fall out with someone, you don't call them out of the blue like everything is ok. My mom says that in some sick way, it's his way of apologizing. I don't buy it. If you can call and say mean and nasty things to me, then you can call and apologize. I've come to the conclusion that he is just crazy and confused. There are no other words for it. And I don't need crazy/confused people in my life. I have enough confusion already!