Need help!!

Hey!! I have been in a relationship for the past 3 years and a few months back we broke up. He was cheating on my back with one of my best friends. I was shocked when I came to know about it. I trusted both of them and they made a fool out of me. I feel like I’m hopeless. I’m not able to control my emotions. It’s Christmas and everyone is happy and my brothers have started the decoration. Usually, it’s me who goes around and make noises during Christmas time but now I don’t feel like to do anything. It’s hurting me a lot. I want to come out of this situation but I don’t know what should I do. My mom is asking me to undergo a depression treatment from a clinic in Toronto. She is very much worried about my condition. I don’t know if there is a solution for this. Now, I don’t trust anyone easily. Please help me!!