If they act up, I wouldn't like to see the Tattler who gave them the code getting stung over it. Just because some rando asks for a code doesn't mean they get one; let them work for it. Going by that post alone, I think "We are all watching" sounds a bit threatening, without any further context.
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I can believe that they would shagged a couple of times, but I see no chemistry or even friend vibes between them. I don't get the sense he fancies her at all. I really do not like his body language towards her in photos and videos. All that eyerolling is contemptous behaviour and he comes across as passive-aggessive. He is doing well to last as long as he has in that house, but she'll get wise to it eventually. I think he is using her for free accomodation and she is using him for discount DIY.