Would you tell your SO the same things you tell your therapist?

I don't have a therapist.. I should lol.  I've had a fucking shitty life tbh. The other night I had a flashback to when I was a little kid. I was hiding in my childhood closet, laying on a pile of clothes. I felt what I did then. The closet was pitch dark and I felt comforted there on the floor, hugging some clothes. That was my safe spot. 
...I've never remembered that before. But all of the sudden I could remember that I had done that in my childhood a thousand times to get away. It made me realize that my depression didn't start at 14, like I thought. It was a childhood tendency of mine to stare out into a pitch black nothing and lay there, feeling nothing, thinking nothing. My boyfriend and I have been together for 4 yrs. We tell each other everything. My immediate reaction was to share with him as it came to me, as he was sitting right beside me as I had the flashback. Is that too much to share with someone? I mean I'm sharing this with all of you right now but idk..... Would that be ok to hear from your partner?