I think it all depends on how comfortable you guys are when it comes to "asking" for money from each other. As a couple, there's a mutual trust that exists between the two of you so that matter won't become an issue. The thing with people in a relationship is that sometimes you can never tell when your partner becomes abusive, money-wise, because you love each other and you're bound to tolerate each other's abusive ways. But I guess logic would tell you when enough is enough. It is just up to you whether you'd choose logic over reason.