I can no longer take care of him so I need to take care of myself.

I've been avoiding my phone for the last 3 days pretty much. I go on there here and there and to answer some people back but for the most part I try not to be on it I keep getting notifications about Glow so I figured this is a sign and its my sign to somewhat release my feelings/emotions and to try and get help/seek advice. My boyfriend of 1 year and a half was cheating on me. I know he was for at least a month but that is all I know. I honestly can't believe it or wrap my head around it. John was the fun loving guy who did everything for everyone. I think at one point in time he use to love and care for me, I just think he fell out of love. Not excusing what he's done, I am in so much pain, I just don't really understand what happend. He hasn't talked to me in three days, ever since it hapoend. Yesterday was suppose to be our 1 year and 7 months. He's seen me but he just acts like nothing bothers him and its killing me because I'm dieing on the inside. We were planning on getting married. I wish I knew what happened. I gave him everything, all of me, and I know for the rest of my life I'll be scared. I need help moving on and figuring out how to keep going. How do I move on and not let it hurt so much? How do I cope? I got a therapist yesterday but my first session won't be for another 2 weeks. I need advice and support please.