Factually, there are more than 5 reasons you need to ask yourself before you decided to reallybreak up with that person.
Over here I am listing only 5 as I feel that this 5 reasons are good and mature enough for anybody to make a comparison and finalize what they will decide.
Firstly - Frequent Argument
How frequent do you argue with your partner?
Once a week? Once a month or is it daily?
Count the number of arguments that you encounter with your partner and state them in a period of month or week. The frequency of arguments over a period of time where you have been knowing each other. Once a month is still not bad but if it happens weekly, you need to be careful. Do not compare with your friends partner as this will only worsen the situation.
Then, recall back what kind of argument that is always broke out. Is it a small one or a big matter that you need to argue over it.
Think rationally about those issue that lead into an argument. Is it worth to argue for or not. Whether the issue is serious and need to resolve as soon or can bring it forward later.
Secondly - Being Selfish
Is your partner being selfish towards you? Always think of himself first or other people than you. Do you feel that you are not his or her priority in making decision on certain issues. If you feel that your partner do not take you in consideration for some regular matters or take things over too lightly, then you may want to consider a break up before it get more hurts.
Thirdly - Boredom
If you find that every meet up, activities and discussion are routine and monotonous, this will soon be a boredom as there is no spark to brighten up the relationship. Both partner has no ideas on how to make every meeting a meaningful ones. Not making any effort to enlighten the relationship on every dates also contribute to boreness in a relationship.
Fouth - Feeling Abuse
If you have been feeling abuse in any relationship initially, this is the most critical and there is a need to end the relationship or suggest a break up. You may be afraid to voice out the break up as it has been a long term relationship. But do consult a counsellor or share with your peers regarding the feeling being abuse that you have since knowing each other.
Lastly - Suspicious
There must be something or doings from your partner that create a suspicious feeling in you. If sincerity does not shown up at an early relationship, do not waste any of your time with that partner. It can be that your partner may be serious having a relationship with you that make him or her putting an air in every speech or acts.
Do consider some other reasons that you can think of and question yourself if that is one of the main that you need to consider a Break Up