In my opinion, true love in a couple is characterized by the following components.
1. Exclusivity, uniqueness of feelings towards a partner, striking dissimilarity from all other relationships.
2. Willingness to sacrifice something valuable for the sake of a person and his happiness. Moreover, nothing is needed from this person in return.
3. The desire to give yourself and do something nice for your partner selflessly, without expecting anything in return.
4. Allow your partner to be himself, as he is, with all his features.
5. Perceive these features not as shortcomings and defects, but as components of his holistic image, the personality that you liked initially.
6. Allow (or better yet, facilitate) a person to follow his own interests and realize his personal desires. This is the only way he can be happy with you.
7. Change yourself and your habits, adapt to your partner for the sake of general comfort and creating favorable living conditions together (not necessarily in a common living space). Without an obsessive desire to change (demand, blame) your partner, but rather, understand and change yourself.
8.Be kind to him (be able to forgive), caring and gentle.
9. Understand (want to understand) his true motives and reasons for his actions, their importance for him.