I snooped through DHs texts the other day, to find texts from a female colleague, which indicates they (and maybe others - not sure) have a regular arrangement to get stoned together every Friday after work. He was really happy that he has a regular babysitter now so he can do this 
I know DH smokes weed, not my bag, but not the end of the world.
I am probably BU, cos I shouldn't have snooped (old trust issues rear their head occasionally) but I feel churny about him and this girl and their little meetings 
He is a good husband in almost every other way, do you think I am being paranoid/ unreasonable?