How Do I Know When to Break Up?

Sa

My boyfriend and I have found ourselves in a cycle of almost breaking up. Neither of us want to separate, but it seems like the only way things are going. When do I call it quits, or am I just doomed to letting any relationship issue that could potentially be a deal-breaker fly at this point? Is that how long-lasting relationships are, a series of almosts and deciding to stay? I don't know, but something isn't right.