I've lived with multiple roommates a few times when I was your age and I've seen what happens when two roommates hook up. I know that there are exceptions, but with my roomies, every single time two of them hooked up, it lasted for about two-three weeks, one of them started acting weird or developed an interest in someone else, and then there was the trouble and discomfort of one or both of them quickly having to find a new place to live, or new roommates, leaving me and my other roomies with the responsibility of finding their replacements.
My recommendation would be to avoid getting involved.
My recommendation would be to avoid getting involved.