It is healthy that you broke down and you still feel that way. It is natural. You shouldn't prevent yourself from feeling the pain since it's the body letting you know that it has been psychologically wounded. However, don't let the pain the hurtful emotions - anger, bitterness and hatred continue for long. Two weeks is alright. Beyond that, they will affect you negatively both physically and mentally.
It is painful but the breakup enabled you to know that the man was married and he had fixed his marriage issue with his wife.
You will need to move on with your life and try to forget the guy or think about him or the need to try to get him back.
Search for this article on internet: Steps to Healing and Recovering from Breakup. It will guide you how to heal from the pain as a result of the breakup and what you find out, and how to recover so you can move on.