Re: Maintaining Boundaries
why he getting footrubs? It's a bit of a personal thing, but as someone who gets cramping in feet from high arches, all footrubs greatfully received. But still it's a bit of a personal thing.
The other important question is "Who is this guy to you?". If he's a mentor, study buddy, training partner (eg dance/martial arts), family friend, workmate of hers not particularly big deal. If it's a friend of yours...a bit more odd (since you not there, but somethings schedules work like that if he's not there long). But if he's your buddy, footrubs are really borderline, even with health issue (unless acute) (although Rene of 'ello 'ello pops into mind "silly woman, can't you see the poor girl has ..." ).
But all those things assume (1) Your attention, support, sex life are satisfactory; (2) they have valid reason to chat and hang out.
Beyond that? I'd be getting something like a Canary (home security device, with motion sensitive cloud-based recording functionality) and putting it in the house. If suddenly they're not talking in public space any more, or the device is getting moved/disabled then you have good reason to expect somethings wrong - and with the added bonus that such devices are great for catching regular burglars.