Help!

My cousin husband is been texting me awkwardly like he would ask me how am I doing and sending me inappropriate pictures of his private part.and I was not comfertble of how this was going so I was ignoring his text and delete it this whole time.i don't knw wat to do should I tell the wife about this?i think it was wrong that he does that to me and to his wife.i just don't knw should I tell the wife/cousin? I could use some of your help.thanks