Does a Scorpio man feel guilty if he knows he hurt you or he doesn't care?

My husband is Scorpio and we are married for four years. I recently read his whatsapp chat with his elder sister (aka my sis inlaw). My sibling is going through a divorce and I had asked my husband not to tell his family as my parents said that "we will directly tell them when the time is right" (note: my husband belongs to a traditional family). He still told his sister and asked her not to question me about it. Also, his sister bitched about me to him saying that "she is egoistic, but you are understanding and you need to handle her nature" My husband even said "yes shes emotional and sensitive" but she still continued and said "she must be emotional but she is not a kid." Just FYI that I have very little interaction with his sister, as we live in different countries and I have met her twice in my life. Honestly I was shocked as I thought we had a smooth relationship and couldn't understand why she would do something like this...

I told my husband and he was amazed that I knew all this and didn't even question why I read his chat or anything. He just went quiet. It was me who kept acting normal and then he became fine. But I am really pissed as he didn't say anything or acknowledge the convo and only when I acted normal did he start talking to me again...but not a word about the whole chat with his sister

My husband is scorpio and I know they pull back. But what does this mean - does he not care? is he guilty because he knows what was said about me was wrong? or he thinks I don't have the right to read his personal chat? BTW his sister is scorpio too and is age 40+.

Opinions please?