The first thing you need to do is really examine your own feelings. Look at yourself as you think others might be seeing you. Do they see a person who is controlling, one who can't let anyone else be right, or maybe one who is afraid of change? Then think about what feelings you have that are contributing to that image.
Then go to the questionnaire at FeelBachand be completely honest filling it out - even if it feels painful to face truths about your own behavior. Remember, this isn't being broadcast to the world - this is you talking with you.
When you see what blend is recommended for you, take a look at the individual essences and read what they'll do for you.
Then, if you're committed to healing the relationship, get your blend and let it begin working on your energies - so the next time you feel attacked by that other person you can respond from a better place. You should soon see that your changed reactions will cause a better reaction from them - and it should get better and better until your relationship is back on a track of love and understanding.
Relationships with those we love are too precious to let them fall by the wayside when there are simple ways to save them.