* Intimacy is intimacy and mutual support, partnership. It increases as the lovers approach each other and may not manifest itself in a calm, measured life. However, in a crisis situation, when a couple has to overcome difficulties together, it is clearly expressed.
* Passion is a feeling.It reaches its highest point at the beginning of a relationship, but stops growing in a long-term one. However, this does not mean that there is no passion in a long marriage — it just ceases to be an important motivator for the couple.
* Commitment — the willingness to be faithful to another person. This is the only component of love that increases over time in any relationship — both long-term and short-term-and becomes an increasingly significant aspect.
And which of the factors would you add? Maybe sympathy? Obsession?