I experienced this with my T a lot. I brought it up and we discussed it. We never really got to the bottom of it so I still don't know the answer but did discuss some potential scenarios as to what may have been happening. My thoughts are either he was pulling back perhaps not even consciously aware that's what he was doing after getting so close or we were unconsciously reenacting patterns from my past. I was so used to being brought up by someone who I would have been very close and connected to one week and horrifying and detached the next week. It's definitely worth bringing up!