I can understand how your feeling completely!. I was the same i was indeed angry and still am a little with my ex moving onto another guy so quickly and even now im seeing someone and it still feels rushed and wrong. Ignorance is bliss in this circumstance and it does help alot!. Seeing my ex dating others killed me until i got rid of the possibility of even stalking her social media so you have done the right thing in my opinion there. It is lonely and even with friends and family you can feel alone. I still do at times. But it dulls over time. Even now i find the thought of my ex creeps back but less frequently. Its taken me alot of energy healing myself slowly. Hope you feel better soon!.