Idk what to title this. It's been 8 months since Dday. My BP has gotten really good at acting happy/joyful/loving/normal around me all the time (which they insist is genuine but I don't understand how it's possible). From the outside looking in you'd think BP has moved on (but obviously hasn't).

I know they (obviously) still struggle with emotional flooding frequently and hatred of the situation ( maybe of me?), anger, sadness, bitterness, disgust, everything, but they don't share those feelings or times with me anymore (it's been a few weeks); so when they did share those feelings with me again recently, I acted out of shame and gave BP space despite them wanting to be together and act normal. Here's the issue I don't know what to do with, and would like advice:
When my BP shares their feelings with me that they are angry and sad and disgusted at what I did, HOW can BPs not want space? I know I shouldn't assume, but I would think that when feeling those feelings, the BP would be disgusted to even look at or think about the WP, so I default to giving space and not make the disgust worse with my presence. But no, my BP immediately after sharing the feelings suddenly acts happy/normal again and wants to be with me and gets upset when I don't act normal immediately but instead am quiet. I'm SO CONFUSED how this is possible. And how do I show support/be happy and loving after they share they are angry and sad at what I did?! Anyone know how to snap out of it??

I have read here a million times that WPs should be supportive and thinking of the BP in these situations, but my "thinking of the BP and not myself" IS giving them space to not look at me and be reminded of what I did and showing them their pain is valid and matters! Any advice welcome <3