<human>: Give me the gist of the text in a nutshell

So we have been having problems off and on for about a year now. Most recently I found her "sexting" with other guys through a chat app on her phone... This was something I felt with time, we could work through...
That was about 6 weeks ago, and things have progressively gotten worse. Last week she got a ride home from her friend's husband... at 1 O'oclock in the morning. I wasn't overly concerned with it, but the next day I seen he had been texting her for awhile after he dropped her off and later that morning. He said things like *" i'll smack that ass"* and *"I'm here if you need a proper spanking"*. So we get into it over this. She tells him the next day that I got upset about it and he says he was just joking...
She continues to text him daily and doesn't see any problem with this.  
Am I the crazy one or is it justified to feel this is inappropriate?
<bot>: Wife continues to text guy that said he he wants to *"smack that ass" and " give her a proper spanking***