Lonely, I'm Mr Lonely, I'm on my own...OOoo

What does it take for a relationship to stay long? No one knows? How can one couple determine to stay together till marraige? Some says they should stay together (co-habitant) to know about each other. Some says that couples should keep themselves pure before marraige. Others just tend to flock the idea of try first, think later.
Having mixed up with conservative ideas with ,modenised all-people-also-do mentality; my relationship really turns upside down.
I really do not know what is it to be in a relationship. I cares, I concerns, I try to understands but all this just not enough. It's just not satisfying!
I once being asked, you do all these out of responsibility as a bf or you really want to do it? I mean what's the difference? What is love? To sacrifies, to give all, to receive ...
What is the real love? John 3:16 - For God so love the world that He gaves His nly Begotten Son that whoever believes in Him shall not die but have eternal life What about agape love? Love between a man and a woman. What about phileo love? Love between friends / brothers.
Guess the love of God shouldn't just die there. He's always there not matter what comes into our life.