I think the whole issue with Frankie being paired with someone is actually pretty common. It's common nature of fan boys and girls to pair people up simply because they want the character to be "happy" with someone, or to throw a little love and romance into a series.
Movies and TV have proven that love can exist almost anywhere and in any show. Similar incidents happened in "Ben 10", Ben the titluar character has a co-star girl named Gwen who is his cousin. People still propose a pairing idea simply because of the need for love and relationships.
I also find Mac's reason for "loving" Frankie to be more plausible then most puppy love cases. Mac didn't go gaa gaa over Frankie for her looks, he did it over her actions, and most importantly, her words. The words Frankie said to Mac are words that not even adult, teenage boys hear often in their entire lifetimes.
I don'tr get bothered or annoyed by this, Mac cares for Frankie and be it misguided or misunderstood, he still cares deeply for her. Doesn't necessarily mean it's love but like I said, it's a form of devotion and affection towards Frankie and I'm never one to argue with that kind of direction of reasoning.
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