Some new impressions (reposted from the BY). Just my opinions.
Upon re-watching the latest ep, I've come to a few revelations. One: the ADD is an A-S-S. His personality just seemed off to me before, because I thought he was a pretty good guy, but there was all this weirdness between him & the others. I totally got him this time. He's a jerk. Everything he did, he did to irk Seeley. I never realized before because he covered it so well, but all of his actions were conscious jabs at Booth.
I think he knew, like everyone else, that Booth has feelings for Brennan. That's why he made sure that Booth knew he asked her out, & why he looked disbelieving when Booth said there was nothing between them. It also explains why Booth showed no trace of jealousy. He knew from the get-go what Hacker was all about & he was completely schooling his expressions so that Hacker couldn't get any more ammo against him.
When Hacker came back to Booth the second time, he wasn't really worried because of interest in Brennan, he was trying to rub it in, "I'm dating her, possibly because I'm more successful than you. I'm your boss & I can use her against you." Booth tried to punch a hole in that theory, stating that no matter Hacker's rank, Bones couldn't be used by him.
On their date, the moment Brennan let something slip about Booth, Hacker was ready to pounce on that. He wanted to keep her talking about Booth because he was hoping for more ammo to use against him. He wasted no time rubbing it in to Booth that he had access to personal information about him. That was why Booth was so upset. It wasn't just that Bones was telling things, it was that she was letting things slip to someone who could & would use them to hurt Booth.
Now that I know Hacker's a sleaze & his "hail fellow, well met" facade is just a smile to distract you from the knife in your back, the character totally makes sense. As do Booth's reactions around him & what I once saw as an over-reaction to Brennan's indiscretion.
Another little revelation came to me while watching the ending again & again (& again). I love the look on Brennan's face when she's talking to Booth & they're moving in for that almost-kiss. Love it! Her expression is all soft & glowing, intimate, intense, shy & affectionate all at the same time. And I thought, "that's what it's supposed to look like when she's interested in someone, not all nutzo like earlier with Hacker." Bingo, baby. That's why her reaction was so very wrong earlier. They wanted the maximum contrast between silly, trying-too-hard, shallow flirtation, and this very real attraction & affection that is between her & Booth. Some people think there's something wrong that Brennan can still consider dating or sleeping with other men, but in her own way, she's as committed as Booth. There's no way she could ever look at another man the same way she looks at him. Ever. She's a goner, whether she knows it or not.
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“When once you have tasted flight you will always walk the earth with your eyes turned skyward: for there you have been and there you will always be.” - Henry Van Dyke