“…First, a naive model has been studied by Strogatz [1988] in a seminal paper and, then, the analysis has been extended to a series of more general abstract models of romantic relationships [Gragnani et al, 1997;Rinaldi, 1998b;Rinaldi & 36 Gragnani, 1998a,b;Sprott, 2004Sprott, , 2005Rinaldi et al, 2010]. Complex issues involving optimal control theory [Feichtinger et al, 1999;Rey, 2010], time-delays [Liao & Ran, 2007;Son & Park, 2011], fractional-order 38 derivatives [Ahmad & El-Khazali, 2007;Ozalp & Koca, 2012], and time-varying parameters [Sprott, 2005;Wauer et al, 2007;Barley & Cherif, 2011] have also been taken into account as well as love stories involving 40 more than two individuals [Dercole, 1999;Sprott, 2004;Bellomo & Carbonaro, 2006;Ahmad & El-Khazali, 2007;Bellomo & Carbonaro, 2008] However, we must admit that in order to reinforce the analysis and 42 make it more convincing, it is desirable, if not mandatory, to refer to specific and well documented romantic relationships, because the possibility of successfully describing a complex love story with a mathematical 44 model can not be given as granted. In this respect, the existing literature is still quite poor, because only three studies, where love stories are satisfactorily described with mathematical models, are available today.…”