1.Efforts. Efforts should be 50-50 from both sides. Yes there are some time when it becomes 80-20 if he/she is going through a problem or exams but if it remains like this over constant period of time, then I guess its better to rethink about your relationship.

2. Good Communication. A good communication doesn't mean having conversation over phone for 2–3 hours but rather getting to know more about your partner. Like whether is there something bothering her or if she had any exam in nearby future. Remembering this small things can go a long way for an amazing partnership.

3.Trust and Loyalty. No relationship can last without these two. It is harsh but true when people from opposite sex try to get to close to ur girl or man, you feel a volcanic eruption within yourself. It's not a bad thing but if he/she really loves you, they would never do something suspicious. It is a sad thing that loyalty has become some sort of flex today.
Commitment. Trust me no one is ever so...