I am 29 years old male and my engagement is over. My problem is when talking to her my penis size is increasing and little bit urine is going automatically. But we are talking in very open manner. What is the solution to control?

What you are noticing is the pre-ejaculation fluid coming out of your penis, which in slang terms is sometimes called pre-cum. When you are feeling romantic, whether talking on the telephone or even just holding hands with your girlfriend, your body doesn't know if those romantic feelings are going to lead to sexual intercourse or not. All it notices is that your are sexually aroused.