You need to develop long term attachment to that person before infatuation fades.

Love fades when one person in the relationship has many expectations of what a “perfect relationship” is supposed to be like. They expect it to be the way it is in the movies when in reality it’s never going to be anything like that.

Love loses it's intensity over time. Lust which is a lot of what we feel is "love" nowadays DOES fade. Love is waking up in the morning and hugging that significant other close and tight before you both have to leave the bed and be responsible. Love is enjoying one's company, even if it's not fully engaging between both parties. Love only grows stronger because over time we gain a stronger appreciation for the other person. Lust just fades cause the glamour of it all dies out, what's left are two "naked" human beings and that's where real love shows it's face. If one says love loses it's intensity over time, maybe that's less reflective of love, and more reflective of the relationships one finds themselves in.