Well you just have to get in touch with your life before you met him. Infact your life could be better if you never met him he were only so big as important you made him. This pain can actually destroy your life if you let it. What needs doing is dont stop to live but keep in touch with friends, family, try to remember your original dreams and dont quit work. basicaly you have to live rich, otherwise boring life wont let you forget emotional high you just been. When you are feeling low you know you been high. Church can realy help, You need some faith in something that will never change and let you down. If you can go to gym cause hard work will give rest to your mind. ANd you need take good care of yourself anyway cause you still might have a lot of love thats now should be used to love yourself. Cause sooner than you think(within a year) you will meet huntread times better guy who will apreciate how good you are enought to not let go. So you want to be good because you desrve to.
This can help too
Doubt kills more dreams than failure ever will