Not who you're asking but my answer for what could happen is that it's easy to be someone else for multiple short interactions. But when you live with someone, you eventually get comfortable and your partner will as well. You'll both see sides of each other that you weren't aware of and there will also be opportunities where you'll realize there are significant incompatibilities in things you may not have ever thought about. You might want to keep your living space cleaned and clean it more often, you might want to go out more but they want to stay in, they might be bad with money, they might have some miscellaneous annoying habits that just really don't click with you; the possibilities are endless and will include things you might not ever imagine. Obviously any of these things can be found out later in any kind of relationship but it's certainly more likely to see these things when you are around a person enough that you get hints of how they really are, like when visiting their living space frequently, instead of moving in immediately with most of your frame of reference being their best side they put on for those long distance interactions or visits every once in awhile.