your true love last about six months."
The reason for this sarcastic remark is rooted in simple statistics which weigh upon two undeniable facts of human relationships.
1) We are willing to accept any degree of ectasy, joy, etc. from another but will tolerate only a limited amount of suffering generated by that person.
To accept unlimited quantities of suffering from another individual is to become the slave of that individual ... one loses his autonomy.Hence, this state is best represented by a "Maxwellian distribution" curve.
[Like the velocities of individual air molecules at room temperature ... They are not constrained by any particular upper limit but they can't go any slower than "zero" mph.]
2) Those who bring us joy have also the power to bring sadness and disappointment. Joy and suffering are "ying & yang". They come in equal quantities averaged over extended periods and actually define each other.
Hence, the probability is that someone who excites our passions will also bring such suffering as to be intolerable ... and the relationship ends there. Not always true ... just most probable.
Mickey Rooney made a statement to the effect that "We don't marry the one we love. We marry the one we like." Here, the probability is that the partner who is more of a friend than a lover has the greater chance of not exciting our "defensive rejection" and thus sticks around long enough to make it to the altar.
... why don't you put it up !?"