How can I get my life back together after a break-up?

I put everything into the relationship, I was with him for a year and a half, I lost alot of my relationships with friends because i was just, overtaken, by the relationship, it consumed me, I was obsessed, and it was an emotional rollercoaster, it trns out we were not meant for each other. Now im alone. I dont know how to deal. I feel lost. I barely evn talk to my friends anymore and now im just embarred to talk to them because i havent been there for them. I feel so alone. Im feel heartbroken, its a deep, to my core pain of lonliness and hurt. What can i do?