Mindfulness can help with calming and ultimately embracing a happier heart. Mindfulness releases the need for control as well as the tendency toward needing to react.
I like to use my practice in the following way - I Stop. Think. Process. Look at the big picture. Decide. Decide again. Act. (Or "act" by doing nothing and letting it all pass and move forward in peace).
I look back to a few years ago and realize that I was operating on reaction, but now some of my first thoughts are:
"Isn't that interesting?"
"What's really going on here?"
"Is this worth my time to get bothered by?"
"Is this really that big of a deal?"
"What are my goals (both personally and with the relationship at hand here)?"
"Who do I really want to be?"
"How do I ultimately want this resolved?"
By the end the answer is almost always rooted in peace, making sure I am taken care of, and making sure I am being moderate, respectful, and balanced. Not reacting from a state of emotion, or a desire for control over others, are good points to note.
My mindfulness practice isn't perfect, but I think I've come a long way.
I really love this video's depiction of a healthy mindfulness practice --https://vimeo.com/152432001