There are two things that I've heard along my life that have hit me as truth when coming to love.
1) In Buddha camp, our teacher said the greatest kind of love is love without attachment. Jealousy isn't an option because this person belongs to themself and not you.
2) From JD Salinger's, Nine Stories - The protaganist (Teddy) is talking about love not being emotional and in the following quote is speaking about how his parents emotionally love him and his sister, "They love their reasons for loving us almost as much as they love us, and most of the time more. It’s not so good, that way."