Please Need advice..

I had a threesome 1 year ago with one of my closest friend when we were having intercourse I stepped out of the room to get some water and came back to my husband of 11 yrs having sex with my friend I know I consented to having a threesome but seeing him having sex with her without me being there really hurt my feelings as soon as I saw that I told him I wanted to leave it has been 1 year and I have had that image in my head am I wrong for still bringing it up it’s something I can’t get out of my head