Relationship issues

My boyfriend and I have had a very rocky few months. We’ve been on a break but we still live together. It’s been really good and really bad. He thinks I’m mean to him. I think I’m just frustrated at him. It’s this constant circle but when it’s good everything feels hopeful. I just feel so confused all the time but I really don’t want to lose

him. It makes me unbelievably sad to think about. I don’t know what I’m doing. I feel like I’m just doing something wrong because why did it used to be so good? Why is it so bad now? I just have no idea what to do.