I need strength..

I apologize to continue writing my feelings, my anxiety is high, my stomach is at a pit. I woke up this morning with the ugliest feeling in my stomach. My Narc is totally ignoring me and I feet he has ran to his ex of one month, we have been together for 3 years, and that just makes my skin crawl. I honestly feel so hurt, so lost. I feeling part of me is going to lose it and that will sacrifice everything I have tried so hard for this man. We are not officially broken-up yet he is playing the silent treatment and will not talk to me..nothing but a few words. How do I do this?