The following are some of the most important qualities that can contribute to a successful long-term relationship:

Trust. This is probably the most important quality in a partner for a long-term relationship. You can't build relationships without trust.

Respect. Partners should respect each other and accept them as they are, without trying to change each other.

Support. Partners should support each other, both in difficult and in good times. It's good when partners can feel that there is someone who will always be there and support them.

Communication. Good communication is a key factor for long-term relationships. Partners should be able to talk to each other about everything, including difficulties and problems.

Honesty. Honesty is another quality that must be present in a partner for a long–term relationship. You can't build a relationship on a lie.

Compassion. Partners should be ready to understand and sympathize with each other, especially in difficult moments.

Sense of humor. A sense of humor can help in experiencing difficulties and mitigate tense situations. It is important that partners can laugh together.

Openness. Partners should be open to each other to share their thoughts, feelings and desires.

Independence. Although mutual support is important in a relationship, partners should also be able to maintain their independence and individuality.

Compatibility. Finally, partners must be compatible with each other so that their relationship can last for a long time.