My husband and I are on a break and I saw a female leaving our house: Advice?re

My husband and I are taking a break and I went to stay with my mom. I had to run by the house after work and grab something and he was not supposed to be there…but as i drove by i saw a female leaving his house and ive never seen herbefore…i get we are on a break but didnt realise we would be seeing other people too…i am hurt and lost and dont know what to do…do i even mention this?