Probably "metamorphosis" is a better way of approaching the question. Infatuation looks nothing like the old love that people who have been married for yours experience. And yet, once that old couple was infatuated with each other.
"True" versus "fake" has to do with the testing phase. No longer a caterpillar, the maturing creature we call "true love" is stretching its wings and seeing if this thing can fly. If you crash to the ground as a couple, sometimes the "fake" part is not known. Sometimes extraordinary deceit is involved. The willingness of the lover to be deceived can also mean that the love is faked.