You can live together as brother and sister, but it’s probably less than ideal. It would be more prudent to try to find another arrangement where you didn’t need to live so closely with the opposite sex. Now true, some people on the forum may have had, say, one successful situation in which they lived successfully for a long period with the opposite sex, without falling into sin. Okay then, more power to them.
Their message to you would be that based on this one successful situation that you, too, would have the same happy ending. Now, they may even turn out to be right. Maybe you could resist temptation, make it work.
However, what if you were only human and felt attraction, which would be normal, almost predictable, really? If you found this happening, would you be willing to scramble to find a new place, even midsemester?
To me, it’s an unknown. Maybe you could, and maybe you couldn’t.
It’d be more appropriate to avoid, insofar as possible, temptation.
I think a lot of people get themselves into problems by overestimating their strength, thinking they can’t fall. Then, after they fall, they realize the oldtimers. with more traditional values who advocated caution, were right all along.
I was reading one article that was on infidelity in marriage, and it was saying some people make the mistake of thinking they could never be unfaithful. It said that people who admitted to themselves they could fall were more realistic, would do better, because they could then more successfully take steps to prevent this from happening.
It’s the ones who are overconfident that are at more risk. You might be thinking, “I can’t fall”, “It can’t happen to me”.
Can it happen to you? Yes. Will it? We don’t know.
Now, they recommend we not place ourselves in “near occasion” of sin, that we not tempt fate. Secondly, there is such a thing as “giving scandal”
newadvent.org/summa/3043.htm,
Also, what about everybody’s reputation? What about the example one is giving to others?
It’d be preferable to find another living situation that would be more conducive to promoting the values you seem to aspire to.