You mean "pretend to be versatile", right? That convo was so dull, he wouldn't talk about anything he's into. I bet he's the kind of person who says he's into everything, you meet, and he makes vanilla look kinky.
As for relationships - before he decided to become a Youtuber (and scam two grand out of suckers to launch his channel) his Youtube profile showed his favourite videos. One was a Dan Savage video titled "why monogamy is ridiculous", so yeah, he wasn't ever going to be the faithful boyfriend.
I tend to think that they had an open relationship, but couldn't admit that publicly because their tween fans couldn't have accepted something like that. That, or Jackson is really really dumb.