Roommate's Unwanted Attention on Boyfriend

My roommate calls my boyfriend our boyfriend. I, a 19 year old woman,

have been dating my boyfriend Will, a 20 year old man, for about six months now.

One of my roommates, Cass, a 19 year old woman, was dumped near the end of September,

and since then, I felt like she has been weird with Will. A few examples:

Sometimes he’ll cook for me if I’m busy at school or working late at the lab,

and oftentimes he’ll make enough for my roommates too. Almost every time this happens,

Cass makes comments about how he’s so sweet and how she wishes she had someone like him and how

her ex would never. Will and I usually reassure her and tell her she’ll definitely find