I really can't understand why he acted this way?

It's a really long story but a very feminine gay male friend of mine really back stabbed me. I only knew him for 2 years but it seemed much longer! We were like soul mates so to speak. He didn't give me a college graduation ticket but took my 75 dollar gift. I didn't really wanna go anyway but that isn't the point. He gave the tickets to 2 other "friends" who he talked about like dogs. He knew them since high school but they weren't half as loyal, supportive and generous as I was. 2 weeks after the graduation he wanted to be friends again. But I said no, let's just act like we never knew each other. I even changed my phone number. For several months he told the waitress at our favorite diner, my sister, my hair dresser and a few other mutual friends a bunch of lies about me. He made me it sound as if I did him dirty. Nearly a year later I still haven't gotten a sincere apology or my money back. What would you do if you were me?