Relationship problems.

So my bf and I have been dating for 3 years on and off. We recently just got back together a week ago. The last time we were together was 3 weeks ago and I did live with him. When we broke up I moved out and two weeks later we got back together, that brings us to today. We were talking tonight and he said that he doesn’t think this will workout bcz we fight to much, clearly I cried cz I put all my effort into this relationship. So then he said I’ll make a deal with u if we can go a week without fighting I’ll stay and if not then we’re done. So what should I do. What are some good ways to stop arguing and fighting. Without taking a break.