Peeta would be surprised to find that Sunshine thinks he's acting overly protective. Really he's just curious, even more so since she doesn't seem particularly pleased about her last encounter with Spike, even though it's clear she feels something for him. And, yes, that makes him worried, just a little.

He's initially surprised by her explanation of how she met Spike, but then realizes that it all makes sense. Rifties tend to form a special type of bond with the person who first finds them - whether the meeting goes well or not. All he has to do is think about when Daine found him, and the connection between Sunshine and Spike becomes clearer. Still, the way the two first met doesn't explain why she's less than happy about what Peeta suspects was their last meeting, so he does pry a little.

"And how long have the two of you been together?" he asks, softening the bluntness of the question with a teasing smile.