Your situation sounds promising. I am glad to see that his other relationship is over. That is a huge plus. Now having said that, the best thing I can offer is that you need to continue what you are doing. And remember he was dumped so a man will look to his last woman in that situation. Make sure he is sincere. Make sure he understands the ramifications of his action. Make sure you really communicate. And this is big. Fix what you have to fix in the relationship before you jump headlong back into it.
