Recently, my T told me what does she feel (it was in response to what I said to her) and after this, I felt really connected and closer to T. And generally more motivated to share things with her. Then, in the next session, we discussed this and I realized that she didn't say about her real feelings but it was about something she felt because she thinks I feel like that (ok it's complicated but there were just *my feelings* which she just received, not her feelings from her "soul").
And then... boom! After this, everything disappeared. I feel no connection, don't want to share things etc.

So, I think in my case there is the "up" phase when I feel real support, trust, and connection from T - and then I feel good in this relationship and want to act similarly.