Welcome to SR. I only joined a few weeks ago but this place quite literally kept me sane and prevented a breakdown.
I know exactly how you feel, my relationship ended recently after 5 + years and it's terribly hard. You are so young and much wiser than me for taking this step. How I wish I'd have left, my XABF got rid of me, completely cut me out and it's devestating. You have taken control of the situation and made the best decision for you. You can't see it now but you won't regret it and please don't take it back.
Surround yourself with friends and family and tell them the truth about everything. Trust me it is important that you do, so much of our lives become consumed with covering up and protecting them. He will not show you the same compassion. Be strong.