Over time, while browsing the web, I came across comments, experiences, and thoughts about love, romantic feelings, and friendship. Among them, two rules: the 3 A rule and the 5 R rule.
The 3 A rule
Affection, Attraction, Admiration. We know we love someone when these 3 A are present.
We can love someone but she may not be the “right person” for oneself. We know this with the 5 R rule:
The 5 R rule
Reassuring, Respectful, Rib together, Makes us dReam, Makes us Radiate 
When these 5 R are present, we know that we can live together with that person.