Got my heart broken and I don’t know what to do

I was dating this guy who should me the world. I was always going on adventures with him and just experiencing life and the many wonders. I thought we were both happy everything was fine. Then he texts me goodnight and decided to go out. While he was out he got super drunk and slept with another girl.

I feel like heartache is the only thing i know. I suffer from depression and anxiety so I’ve just been in a downhill spiral. I’ve been cheated on before and it didn’t feel like this. I was soo happy. My question is what do I do. I stupidly still want him in my life but I know I shouldn’t. Every time I cry he is the one I want to confide in help!!!