2 year death anniversary

I just got back from a week with my divorced parents to commemorate my brother's death anniversary.

I drove a long way (about 10 hours) with my dog to get to my dad's place. My mother drove in the following day and stayed at my dad's house. That's weird, right? Mom came into the house and she was upset that I didn't greet her with affection or tears (I didn't grow up with an affectionate family so this whole new thing mother has adopted is a little weird for me). She cried (understandably given why she was in town) and did this weird caress and then eventually started slapping me on my leg repeatedly. I don't know what that was about but it was uncomfortable and weird. I had to grab her hands to stop her from continuing what she was doing.

I'm 6 months into my therapy and working on not being so disconnected since my brother died. So I was more or less ready for the flood gates to open and finally be able to feel what I was holding back in grieving my brother.

The day of my brother's passing, my parents and I drove 10 hours total (to and from the site we scattered my brother's ashes). I had to hold separate conversations with my parents, as they weren't really talking to each other on the drive there and back.

When we got there, I gave them space and let them do their thing. And I felt... nothing. I didn't feel sad, scared, happy,... it was just nothing. After the whole thing I felt rather disappointed. I talked to my partner about the experience and he thinks that I disassociated because I didn't feel safe to express myself. After talking to my therapist, she said that she sees it as a positive thing that there weren't any negative associations to not being emotional.

I don't know how to feel about it honestly. Thoughts?