Nobody can answer this for you, and this page will not try. What it can do is separate the four situations that get typed into this same box, because they need very different things, and only one of them is actually a breakup question.
What is usually going on
A bad week, or a bad month. Everything is irritating, the thing they do has become the only thing they do, and leaving looks like relief. It is also what tiredness looks like from inside a relationship. If the feeling is under six weeks old and there is no pattern behind it, it is weather.
A pattern you have raised and nothing changed. You said the thing, more than once, plainly. They heard it, agreed, and it stayed the same. This is not a bad week. This is information about what the relationship will be, and the question is whether you can live inside that.
The relationship got close and you need to leave. Everything was fine — better than fine — and then something closed. You find fault, you need space, you remember an ex more fondly than the facts support. If this has happened before, more than once, at about the same point, the urge is not about them. It is an avoidant attachment response to closeness, and it deserves to be recognised before it makes the decision.
You are afraid of them, or of their reaction to leaving. If the reason you have not already gone is what they would do, this is not a should-I question. It is a how-and-safely question, and it needs people, not a page. Talk to someone who knows you before you talk to them.
What to do tonight
- Date the feeling. When did it start? If you cannot remember a time before it, that is your answer. If it started last Tuesday, wait.
- Write the thing you would say if you left. If it is a list of their faults, you are in a bad week. If it is one sentence about what you cannot live with, you are past that.
- If it is the third case, do nothing for two weeks except notice. The urge to leave a close relationship passes, or it does not — but it should be watched before it is obeyed.
What it depends on
Two people can feel exactly this and need opposite advice. One has stayed too long in something that has been telling them to go for a year. The other is about to leave the first good thing they have had because it got close. The difference is attachment — how you handle distance, and how you handle its absence — and it is the one thing worth knowing before you decide.