Maybe what she means is that you’ve started to lose time for her—that it feels like you’re just living together in the same house, but the sweetness and emotional connection between you two is no longer there.
Your intention of working hard for your future is good, but it’s also important not to lose the care, sweetness, love, and emotional connection between you both. Because what’s the point of building a future if, in the process of focusing too much on work, you lose the love for each other and end up breaking up anyway?