Hey ya'll

I really need advice
I really like this guy Matthew
we were bestfriends up until a short time ago
when we started getting into random arguments over the stupidest stuff and it all started cause i flirt with another one of my friends. but i beleive he is only doing this cause he knows i like him but i won't admit it cause he just wants to prove his point that everyone loves him
it really pisses me off...
the arguments get worse each time we have one and the last one we stopped talking for a week and it was pure hate between us
and we just got into another one about an hour and a half ago...any advice on how to fix things and stop these stupid arguments

Lord i don't know...ok thanx