Welcome to The Erotic Highway, "partner,"
I would have hoped you could have had your own username, but I'm assuming this really is the lady of 'repeatdefender,' so I hope this reaches you all the same.
My point of view is quite simple: you taught your partner a little life lesson. As to whether things will go on for you in this vein, well, your guess is as good as mine.
As to the "doing things as a couple," all I have to say is this: do not force yourself to engage in things you don't want to do. I'm sure you already know that, but it bears repeating. In other words, don't coerce yourself into anything less than absolutely desirable, just to make peace or continue the equalization game. It seems your episode with the male escort had a favorable outcome, but just remember that the more cooks you involve, the weirder the soup can become.
I don't think your partner will put an end to his hobbying forever. He has been very honest about his motivations and he has given you the respect of being truthful. As to "a very common thing for guys to do," well, that's in the eyes of the beholder, no? In my practice, I can tell you that guys visiting with paid professionals are in a minority. Most men who have extramarital sex do so with co-workers or "civilian" mistresses. In some way, they get themselves into way bigger messes than those who strictly hobby. I'm not endorsing one over the other, but if it is as your partner says - strictly for 'fulfilling his genetic imperative' - then maybe count your blessings. Of course our societal ideal is complete fidelity, but I've almost given up on it as a concept for some men.
It's almost heresy for a marriage and family therapist to admit that yes, some men just have inordinate sex drives and an insatiable need for sexual variety, and to accept that as a turn of events. But it seems that this, in some way, is what is preserving your union. Sometimes you have to be sanguine about life, and maybe this is one of those instances. Making injunctions, threats, ultimatums, proscriptions, none of it may work and in fact make things worse. So it's up to you, dear 'lady partner' if you want to hang in there for other benefits of the relationship.
Finally, I am not too worried about you. You seem like a very enterprising and assertive woman, quite capable of taking care of your own emotions and creating viable solutions for yourself. This is the key in all of this - worry about your own feelings, first and foremost. The fact that you "had a better time than he did," I would take with a grain of salt. The grass is always greener....or we always seem to think it, when we've forgotten our own rolling around in the proverbial hay.
Rapt to know ya,
the Love Goddess