Nope, I'd say you had every reason to be upset, if for no other reason than he texted you about how pretty the strippers were.
I wouldn't get "dump him" angry; if he's been loyal, and the guys in question are jerks, it actually is fairly likely he didn't know it was a strip club until it was too late. The problem is really your boyfriend has to be the one to talk to these guys and tell them to knock it off; if they're his coworkers, it's a bit out of your realm.
But, honestly, likely your being really angry at him will be motivation enough.
I don't get why a strip club is such a big deal. I kinda wanna go to one with my boyfriend for my 21st. And I don't care if he looks or gets randy from looking. Just so long as I know I'm the only one he's banging. If you know he's loyal, then I would suggest letting it go. The pretty text was a bit much, but you really have no proof that one of his dick co-workers didn't get a hold of his phone and send that. I would just let it go and be chill.
If they are really jerks, one of them may have taken his phone...
If one of his dick co-workers sent the text without his knowledge, major dick move on their part. If he did, major dick move on his. I don't know if I'd want to keep a guy who would be that stupid and callous.