LOVE!!! :1 Corinthians 13:4 "Charity suffereth long, and is kind; charity envieth not; charity vaunteth  not itself, is not puffed up, 5 Doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil; 6 Rejoiceth not in iniquity, but rejoiceth in the truth;  7 Beareth all things, believeth all things, hopeth all things, endureth all things.
8 Charity never faileth: but whether there be prophecies, they shall fail;  whether there be tongues, they shall cease; whether there be knowledge, it shall vanish away." ...in my romanian bible Charity is translated by LOVE happy Sabbath!!:)
When you have someone that you love, respect and trust. when both of you have something to look forward to and if you are not with that person you can generate many questions to ask them in anticipation of when you see them again. It could be a question or it could be a story to share, it could be serious, funny, informative. It is recognizing that person has flaws and you are able to love them unconditionally and you are willing to work them.
But all of that being said, if God is not at the centre of that relationship Trizah, the substance will slowly deplete, the qualities of Christ in both parties is what is going to make the relationship be of substance. Notice i said both parties.