The initial stages of relationships are generally found to be stable and free of greater issues as the adjustment and tolerance are more. But as the time passes on and the formal ways are replaced with the casual attitudes the issues can come up. If not taken the right measures of problem solving, they can spoil the relationship and end in breakups.

Poor communication

Poor communication is one of the greatest causes for most of the bulging issues in any communication. There should be very strong and clear communication between the partners in a relationship. Many a time issues occur not because there is a specific cause, but because the communications get misunderstood. If the messages reach the wrong way to the partner, there can be obvious gaps between the people and a complete breakup in the future.
Do not presume that the partner will understand what you feel and what you want from him/her. Discuss all the aspects of the relationship and make each other well aware of the attitudes, likes, dislikes and expectations of both the partners in the relationship. Do not hesitate to communicate with the partner being afraid of the reaction of the personal or thinking that he/she may think against your point.

Sexual relationship

Sexual activities are aspects where the partners may have very many personal ambitions and when something goes wrong they may feel incompatible with the other one. The way one person wants to maintain the sexual life may not be the same the partner needs it. Again, the right communication is the solution and adjusting without hampering the self honor and dignity. Do not sacrifice all your desires just for the happiness of the partner as it may in future become a cause for discomfort and a possible breakup.

Financial management

People in a relationship may have to cooperate in financial management and many times mutual sharing and expenditures may occur in relationships. "My money is mine and your money is also mine" attitude may, certainly, damage the trust and honor of relationships.
When you get into a relationship, be ready to spend for common needs and share the income for common or personal needs of the partner. Do not keep your income and expenditure a secret with the partner. Similarly make the partner aware of your financial obligations too. Knowing the financial status of each partner may help them share mutually and manage the income in the best ways.

Frequent conflicts

Conflicts are inevitable part in life, how happy and compatible the partners may be. Relationship between two people is just like joining two odd objects. No partners are perfectly alike or absolutely matching. Occasional conflicts are quite natural but getting into frequent quarrels and arguments may spoil the relationship. Avoid all the unnecessary conflicts and never make argument a habit.
Many relationships end in breakups because of the avoidable issues between the partners. Never take an argument in a relationship as issue of honor; rather if the partner doesn't leave the topic, you withdraw deliberately. Be wise to choose how to react and when to react. Understanding the partner perfectly will help a person to decide how to react in conflicts.

Trust is everything

It is truly said that it is the trust that give thrust to the relationships. Two people get into relationship because they feel each other lovable and trustworthy. The partners need to be careful not to break trust if they really need to cherish a long term relationship. Lying to the partner, concealing certain facts from him/her etc., are detrimental actions in any relationship.
Be open and frank to the partner and create a free atmosphere between them so that there won't be a need of telling lies. Being constant, being ion time, adhering to promises being fair in arguments, being good listener etc., are advisable modes of maintaining the trust between the partners in a relationship.