Emotions aren't a choice. They are just running in your brain.
Your brain creates the illusion that you are "FREE".
But, in fact, we are run by our emotions.
When you are feeling emotional about something when you are in a relationship with a woman. Avoid making decisions in that moment when you are feeling emotional (whether it be anger, jealousy, fear, sadness or even happiness).
The stronger the emotion, the more important that you avoid acting on it at that time.
The reason is that strong emotions hijack our thinking process. In many cases you are simply responding to millions of years old emotional programming or to your own past experiences when you act while feeling strong emotions. You are repeating patterns of behavior that can give you the opposite result of what you would like.
Worst of all, your emotions will rationalize any decision or action you make when under their influence to cover your emotional tracks. So you won't even be aware of having been driven by emotions at the time. Spooky isn't it...