If you have been in a relationship, you have most likely had some sort of argument or small fight over a disagreement. It is not uncommon. However, if you tend to fight with your significant other very often, with no improvement on what the fight was on, or the fighting leads to the feeling of guilt when it was not your fault or out of your control, that can be a red flag to leave the relationship.
When you and your significant other come to a disagreement or an issue occurs in the relationship, you should be able to work it out in a peaceful manner. You should be talking to each other as equals within the relationship, not as one person is the better person in the relationship.
It should not be a yelling match.
If every single fight is leaving one person in the relationship in tears, guilt, feeling worthless, then you may need to rethink your relationship.
Arguments can be healthy in a relationship to help bring up current issues in a relationship as long as they are discussed in a healthy way. A healthy fight will often include calm (but can be stern) voices, eye contact, listening while the other is talking, expressing their feelings on the subject, and coming to a conclusion.
You should be able to work on the issue together because that is what a relationship is: Two people coming together as one.
Once name-calling, degrading, ignoring what the other is saying and god forbid, hitting occurs, it is no longer your normal fight. That is not a healthy way to handle disagreements in a relationship. It's on its way to becoming an abusive relationship if not handled properly.
Also, if your significant other is always bringing up past issues, that you thought were resolved, it may be time to leave.
A healthy fight should only focus on current issues, not those that were discussed and closed.
An issue that can never be closed, may be a reason to move on from that relationship. Without a conclusion or resolution to fix that problem, it will always be a problem in the relationship.
Fights in arguments can be healthy when you listen to one another, but one-sided fights often lead to worse occurrences. Always pay attention to how your significant other handles the fight/argument, pay attention to the signs. You deserve to be in a relationship that you are happy, comfortable, and feel heard in.