I have a massive soft spot for creative/musical types and he's so secure and seemed wise (rose-tinted glasses perhaps!). The things he creates are beautiful and exciting and I always felt so highly respected by him until this happened. But, I won't let anyone make me feel bad for the choices I've made.
I'll prepare myself.
You're right to stand up for your personal choices and not let anyone try to treat you badly because of them. Definitely!
And although I was rather harsh in my post above, you did say that he's not spoken to you for a bit (because of being upset, presumably) so although this isn't the most enjoyable thing for you, it may be that he is actually acting in the best way by going off to think things over rather than hurling abuse at you etc. This is all assuming that he does somehow know about your job and that he does have a problem with it - if you read some of the other threads on this forum, you'll see some of the behaviour that working women endure from their partners and it's far worse than a bit of a silence.
So it could be that he doesn't know and is just off trying to sort his head out in a mature way (i.e. without dragging you into a bunch of horrid arguments that go in pointless circles because they're entirely based on insecurities and fears and other things that can't be fixed by shouting insults), or it could be that he does know and is off doing the same thing. Definitely do prepare yourself for the worst but also prepare yourself to listen if he comes back to you with an honest (and polite and respectful!) need to talk, if you want to listen.
The thing about him not really respecting escorts despite having paid for sex (having an ex-girlfriend there at the time makes no difference) really alarms me because people who have these sorts of dreadful double-standards are often pretty unpleasant to be around for one reason or another. But as I said, maybe his current silence is so that he can think these things through and figure it out sensibly. I wouldn't recommend trying to interrupt him too soon!
On the other hand, if his silence is to "punish" you, then you may have to look at the rather unenjoyable but inevitable task of taking off those rose-tinted glasses.
((hugs)) But as I said, you'll be okay if you stay level-headed as much as you can.