At the beginning of therapy, I lied and broke a promise. I was very suicidal. He obviously found out about that one, but he was not angry or disappointed as far as I could tell, he felt very caring.I didn't feel like I had to regain any trust or repair anything, since we'd only known for maybe a month or a bit more total.

Since then not so much. Sometimes I don't mention something, which some people might say is lying by omission. But I try to be up front about the important parts, like I might tell him I am struggling with SH from time to time, but not mention every single instance of doing it if I'm in a phase where that happens a lot. I'm also mostly honest if he asks directly, though sometimes I realize later that we might have misunderstood, but so far that has never caused any issues.