Me and my cousin

I don't know if I'm overthinking it. My cousin sent me a message some time ago saying that she had cheated on her boyfriend. Of course, as her cousin, I could only tell her to be careful. She said her brother-in-law had cheated on her first. I did not communicate with her from the perspective of traditional morality, but from the perspective of human nature, telling her what she needed to pay attention to (after all, there are many diseases now, including the fact that there may be hidden cameras in the place where you choose to date). She responded very well and said that she felt very close to me when chatting with me. She also planned to ask me out to practice driving with her in the future. I think our communication is already very private. In fact, I remember that when we were young, we lived together once. At night, I put my hand into her quilt and touched her private parts. I closed my eyes at the time. When I touched her there, I opened my eyes and saw my cousin staring at me tightly. I was scared at the time, so I retracted my hand. Of course, nothing happened after that night. More than a month later, we met again, and my cousin told me not to tell anyone about what happened that night. Now we have grown up and have started families. I think she confided in me because she felt we were of the same age, but I felt something strange inside.