One of the main benefits of a long-term relationship is the ability to develop a deep connection and level of trust between partners. When you spend a lot of time together and go through various life challenges together, you get to know each other so well that you can completely rely on each other.
Long-term relationships provide an opportunity to build the future together. Partners can create a family, common financial plans, develop common goals and dreams, which can contribute to the strengthening and stability of relationships. Emotional support is important in any life, and having a person who is always there in joy and sorrow can greatly ease many of life's trials.

But there are also bad sides... Routine can lead to a loss of passion and interest in a partner, which in turn can negatively affect the quality of the relationship. In a long relationship, each partner has to adapt to the other. Sometimes this can lead to the loss of one's own identity or the suppression of personal interests.
If expectations are not met, a long relationship can lead to disappointment. Often couples change over time, and there is a risk that they will become different in their values and dreams.
The main thing in any relationship is openness, honesty, willingness to work on problems and a joint desire for a happy and harmonious life. If partners are willing to support each other and grow together, then a long-term relationship can be a valuable and fulfilling experience.