though i cannot fully judge your relationship based only on what you have written. it seems to me that you should leave that guy and move ahead in life. also remember you are only one that is capable to make yourself happy or sad. Don't make yourself vulnerable and be torn apart by others actions. believe yourself,love yourself, build on your good things. Also try to have a purpose in your life. This will motivate you and stop you from distraction. Also time is the biggest healer and I am sure you will surely find a way out this bad time.