Guilt from sharing intrusive thoughts (please help)

Hi,

So I don't really have intrusive thoughts any more, I'm 19 years old.
But when I was about 12 or 13, I used to have pretty bad OCD and persistent intrusive thoughts. These included sexual and harmful intrusive thoughts about family members, my father in particular.
I found them really disgusting and difficult to deal with, but I didn't know what they were at the time so I wanted to get it off my chest and I told my dad about them in detail so that I could get the weight off my chest and stop feeling guilt about the intrusive thoughts.
He got really distressed from it (as you would) and recently he told me that he went to see a psychologist (while discussing some other issue) around that time which helped him deal with *a* issue (but I'm pretty sure I know what it was).
We didn't really talk about it much after that all happened, but I still feel incredibly guilty for making him distressed and putting that awkward strain there. The relationship has been pretty good after that, as in normal and neither of us brought it up again.

I don't really want to bring it up again after all these years especially considering he said the psychologist helped him think about *it* in a different way. Does that mean he understands?

I just need help dealing with the guilt from it. I can't stop thinking about it and feeling sick that I vocalised it. Please help me find a way to deal with it.