I try to avoid engaging in mind-reading, but as others have mentioned, there are many valid reasons for asking a client to come more often. I would take it as a good sign. If nothing else it means that the therapist is really invested in you doing well and is committed to your progress. I remember when I was working as a tutor for middle school kids, I would sometimes feel frustrated because the parents could only afford to send their kid to see me once a week and I wished I could see them more often because I could tell they were learning and really wanted to improve but we were never able to cover everything in the one hour per week we had. I wanted to take the extra time to go through each math problem or test question and make sure the student understood each of them thoroughly.
Also, it could very well be that you are improving and the therapist thinks you are improving. But you know, when someone begins to get better, that can often be the most precarious time. Often, that's when repressed memories start to come out. That's when you start feeling the emotions that you've been ignoring.
For me, at a certain stage in my therapy when I felt like I had dealt with one set of problems a new set started to emerge. Example: I had a habit of isolating myself because being around people was just more stress and anxiety. As I began to progress in my therapy and address my real reasons for experiencing so much stress and anxiety, I continued to isolate just out of habit, but at one point realized that, lo and behold, I was lonely. But I had spent so much time isolating I didn't have a clue how to begin to socialize.
In other words, there is plenty of reason to believe he suggesting you come in more often is a positive thing. Like she said, she thinks you could benefit from it. That's all the reason I would need.