A girlfriend moving away without telling the other person implies that she doesn't the respect the speaker to warrant a discussion or notification and the speaker is upset but sarcastically expressing joy by being happy about having more space.
Consider the statement "I felt let down by girlfriend when my girlfriend moved away from my place without consulting with me". Based on this "I felt so respected when my girlfriend decided to move away from my place without telling me, now I have more room!" a true statement? Yes, no, or I don't know?