Hang on to that girl.
Anyone who inspires you to better yourself is a good person to keep around, and having that person be a woman you want to date only magnifies the effect drastically.
Being impressed by your partner is pretty much the ideal situation.
Becoming more intelligent is.....difficult bordering if not impossible....for now.
It's important to understand the difference between intelligence and knowledge.
Knowledge is what you know, intelligence is sort of the horsepower you have to process what you know.
Eating right and exercising can markedly improve cognitive function. The more of the right stuff you do for your body the less energy your body has to expend counteracting the bad stuff, and therefore the more energy you have to spare for thinking. Exercise, likewise, makes your body more efficient, and it gets more oxygen blasting through your system and makes your brain move quicker.
All of that stuff doesn't necessarily improve your actual intelligence per se, so much as they make you function toward the higher end of your base intelligence range while you maintain those practices.
Honestly, the only thing that might make you genuinely more intelligent is just straight-up "practice". The more you use your brain, and the harder you make it work, the better it gets at it.
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Where knowledge is concerned, just DEVOUR science news and follow through on learning about anything you find interesting.
Watch a lot of stuff like:
DNews - https://www.youtube.com/user/DNewsChannel/videos
VSauce - https://www.youtube.com/user/Vsauce/videos
Shots Of Awe - https://www.youtube.com/user/ShotsOfAwe/videos
Nature Hates You - https://www.youtube.com/user/NatureHates/videos
But don't just mindlessly watch a video and stop. When something you see makes you wonder about something, or you find something to be interesting, or something is mentioned that you don't know, GO LOOK IT UP.
Wikipedia is an AMAZING resource.
I'll watch an Assasssin's Creed 4 promo all about Edward Kenway's ship....and then 4 hours later I'll realize I just read every Wikipedia page about every type of ship, cannon, and every famous pirate that existed during the Golden Age Of Piracy. Suddenly I have a much clearer idea of that time and place in history, all because I went beyond a simple commercial and utilized the powers of The Internets.
I can't tell you how much stuff I've learned that way.
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If you use Facebook, follow I Fucking Love Science. She posts all manner of crazy new science news all day every day. You will learn new crazy stuff CONSTANTLY.
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They're not so much informative, but check out Boston Dynamics and Festo if you're interested in robots....and then go learn about them.
https://www.youtube.com/user/BostonDynamics/videos
https://www.youtube.com/user/FestoHQ/videos
Check out the EyeBorg Documentary for CliffNotes on the world of bionic prosthetics (and remember that that video is already a few years old now).
http://youtu.be/IshL18Lh64I
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Other stuff I find awesome:
http://www.pcworld.com/article/253590/skynet_espionage_begins_unmanned_drone_creates_3d_models.html
http://www.extremetech.com/extreme/134672-harvard-cracks-dna-storage-crams-700-terabytes-of-data-into-a-single-gram
http://www.vice-motherboard-test.appspot.com/blog/heads-up-hoverboarders-here-comes-quantum-levitation--2
http://www.escapistmagazine.com/news/view/114297-Scientists-Unveil-Worlds-Lightest-Material
http://www.cracked.com/article_19952_the-6-most-mind-blowing-animal-senses_p2.html?utm_source=facebook&utm_medium=fanpage&utm_campaign=new+article&wa_ibsrc=fanpage
http://www.dailymail.co.uk/sciencetech/article-2119343/King-Wasps-Indonesia-Two-half-inch-monster-jaws-longer-legs.html
http://www.treehugger.com/urban-design/microalgae-lamp-absorbs-150-200-times-more-co2-tree-video.html
http://www.huffingtonpost.com/2013/02/20/scientists-create-new-ear_n_2728612.html?utm_hp_ref=technology
http://mashable.com/2013/05/24/3d-printed-ear-princeton/
http://engineering.columbia.edu/even-defects-graphene-strongest-material-world
http://www.escapistmagazine.com/news/view/113593-Paleontologist-Discovers-Giant-Kraken-Lair
http://en.wikipedia.org/wiki/Megafauna
More than perhaps anything else you do, reflect upon everything you learn, how it related to what you already knew, and how it relates to other things you've discovered.
Eventually you start to build up a vast view of what's out there, and you start to see trends and patterns in what's going on.
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Go forth and conquer!