Well, I would say yes because I did say yes to this question. However, we lived together for longer than 9 weeks - I came over last year and we got married within the 6 months I was allowed without a visa, then I went back to the States to get my visa. In my app I stated the time we lived together - as a couple, of course.
Yes, you want it in there, along with his airline ticket stubs and pictures of the two of you together when he was there - it is proof of a "real relationship", which is what they want to see. The burden of proof is on you and you must provide them evidence of said real relationship; this will help.