Only 2 lights go out, and with the first light in particular there's very clearly a physical impediment in front of it which causes it to go partly dark:
View attachment 1128864
View attachment 1128865
Certainly looks like a leg, plus the images are labeled with the word "surprise" and someone sneaking around outside late at night certainly qualifies as a "surprise". The question then becomes, who's sneaking in or out, and why?
She didn't exactly that, she just said that being in a relationship with someone and seeing other people was "despicable", not that dating different people at the same time was, and when it is just dating, you have to accept that the person you're dating may very well be getting sex elsewhere if you're aware that they're seeing other people. Jill seems to acknowledge that when she says that having competition and knowing the guy she's seeing is dating others isn't "ideal", but she didn't exactly seem virulently opposed or put off by it to the point where she'd dump him if she found out he had sex with someone else.