You need to learn how to have normal conversations. You can only memorize so much material. Having some scripted stuff is awesome, and I highly suggest it, but you cannot write hundreds of hours of dialog to memorize and spout off to your girlfriend.
If you can talk about video games for hours, it's fairly plain that you know how to converse. You just aren't interested in talking about the weather and your exams. The good news is, neither is she. Talk about what interests you and tell her you want to know what interests her. The same way you can go on for hours about video games, she can likely go on for hours about animal rights activism or whatever.
If video games are your only interest in life, then find some girl who is equally obsessed with gaming.
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Build an emotional connection through your hard throbbing cock.
Build trust and comfort by holding their hands and covertly rubbing your elbows on their nipples.
RSDTyler