Yeah, I don't get it. It's not that he's stupid per se but he strikes me as someone lacking in curiosity. Like the type of people who hear about something they aren't familiar with and instead of looking it up they just shrug and carry on. Whereas Taylor seems to be the type to hear something, ask questions, dig into it, and collect phrases, tidbits, whatever for inspiration.
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My boyfriend shares very few interests with me, I thought that was somewhat normal?
I think different interests is one thing, different personality types with little common ground and on top of that different interests might be another.
But we know Tay, she's a mirrorball so she'll be Little Miss NFL for as long as she's with him, so he'll think they share an interest.