Love would prolly have to be at first sight or first met or w/e cause obviously you didnt love the person b4 if you knew them and didnt like them, sticking to that idea, neither of the two would get jealous if someone else like them or gives so and so a hug or what ever, also they wouldnt get bored of each other, and have to have good chemistry with each other and beleive it or not and im not just sayin this cause ima guy but the sex is prolly the most important factor, like something youve never felt b4 idk some where in that nature, going on, they have to support each other and have deep care and always trying to make the other happy so tha