my current girlfriend is real love for some years now
Some years it's not time. To the same friend's wife. You meet only a few hours a day. The rest of the time you have time to relax. When you're living with her then you will face everyday problems and see how long the feelings will subside.
Loving someone truly is a life long commitment. You cannot measure how long your relationship with someone will last. And if you really love someone, you will not give up on him or her and you will not let him or her go. Yes, you might get tired at times but all you have to do is rest because no matter what happens, you, two, will aways get back on each other's arms and continue loving each other.