Cheating husband,,,

I married my husband 1 year ago. Together for almost 4. The past 8 or 9 months he has been hanging out with this guy I never heard about before.. My husband says they have been friends forever. I do not like this friend........ The friend is also married. He has two daughters with his wife that he cheats on. He talks to my husband about the affairs & sends him pictures of naked girls! I don't understand why he is so comfortable telling my husband about his affairs?! & sending him pictures of girls. Instead of my husband telling him in a nice way not to send him the pictures he comments like "she's gotta nice ass but ugly titties"... I can tell my husband has deleted parts of conversations when I went thru the texts. My husband & I have been going thru a rough spell lately & I am wondering if he has cheated or is cheating. He isn't employed right now & I work all the time.. So he has plenty of opportunity. He's also had nights he didn't come home. I wanna hope it's just me but I have a huge feeling he's got something going on...