relationship troubles

me and my bf just turned one year (of dating) last month and since our anniversary things have gone downhill. in our whole year of dating we have fought so much it’s unbelievable. we cannot go more than 2 days without getting into an argument. i understand we both have our flaws but all this fighting has exhausted me in so many ways. i am a diabetic so whenever we fight it affects my health due to the stress. i’m only 19 and i feel like i’ve been married to him for over 20 years. here’s the thing, just a couple of days ago i met this guy through a mutual friend and things have been pretty good with him AS FRIENDS. i have told my bf it’s probably best to go out separate ways but he just doesn’t wanna hear it. i really need advice on what to do.