How to get rid of "Ego"

I have a Girlfriend that I met few years back. She loves me a lot,she is quite brilliant from her childhood, and now she is working in a big firm. I am working in a smaller firm than her. When we were in college, it seems we will not fight ever, but after we got passed and she got placed we are having a lot of fight. She sometimes says some bad words to me, that i can't handle.But i don't want to fight anymore, but I think I've ego problem. Every time i think not to fight but finally we ended up with big fight. What are the practical measures in Buddhism to get rid of such ego inside one's inside. Thank you.