I definitely get the mentality of wanting to deal with everything by yourself, I've been guilty of that way too many times in my own life in the past (^^) It's a very difficult thing to admit to weakness, especially if you're under the impression that you can't without losing face. This is where Mitsuki will come in IMO, she's quite perceptive in her own way, and I'm sure she's already picked up on a lot of the signs before actually seeing the self-harm Aya has been doing to herself.