Grief is a process to go through. In a process, you keep putting one foot in front of the other, and each little step is part of your healing.
Define your real intentions, are you trying to move past the breakup, or are you hoping to get back with your ex partner? You won't move on until you've accepted that the relationship is over. Don't embarrass yourself or put yourself in a situation where you'll look back and feel humiliated. Learn to trust again, whenever you get involved in a relationship, you know there's a risk. Don't let a bad experience keep you from living your life to the fullest. You can go through life suspicious, or loving and laughing..