Emotional Maturity - You should be with someone who is self-aware of their flaws, but also tries to learn from their mistakes.
Quality Interaction - Whenever you are looking for someone to be your partner in life, then it is important that you and your partner can share quality and impactful interaction.
Consistency - With a calm and consistent partner, you are gonna feel a lot more safe and secure.
Respectful and sensitive - It is very important that two partners are respectful and sensitive towards each other's beliefs, values and all other aspects of their lives.