I'm in a similar situation to you right now, except it's a bit vice-versa. My boyfriend and I have been together for 5 years and I've only been escorting for a couple of weeks.
We've had conversations about escorting and prostitution because before I got into it, someone I know was doing it, and I was merely voicing my opinions and such. He made it pretty clear that he would not be supportive of such a lifestyle.
He works out of town and I get 2 days off from college when I do outcalls. I only do one booking each day, so it's a little bit of pocket money, but money I really need. (expensive dental bill, credit card and a fine).
I've been trying to separate my mind, so to speak. When I'm posting here, taking calls and emails, on AW, and with clients, then I am Eve. I don't have any other personality or name. When I am at home, with friends, family, working my part-time shop job or at college, I am the REAL me, the person my mother gave birth to and named.
I do feel like a horrible person, I know I'm deceiving my boyfriend, but I look back at my life and I cheated on all of my ex's. I was a real floozy, always off with whomever would give me attention on that particular day. In some ways I think that I really am a horrible person, and I probably am "doomed to hell" or whatever happens, but no matter what I do, I am always sniffing down the path of trouble.
In some ways, escorting has made an impression on my real life. Somehow my libido has increased and I can "last longer" (even after only 2 weeks), so my boyfriend is getting a great time!
Also, as a poor student, I've always financially struggled, so now I feel financially ok and that stress has been removed from my life so there are no arguments between my boyfriend and I based on money problems.
He's none-the-wiser to my extra money, as I'm ashamed of my credit card debt and the fine I got (always sniffing out trouble, see), so the extra money is going there. When the day comes that I have finished paying these things off, I'm just going to save up, or I can quit escorting.
I know I haven't offered you solution in the slightest, I just wanted to offer my "case study" and sympathise with you. It's hard. As a woman, I want the companionship of a long-term partner, but escorting is a fun and easy way to make money.
I can't advise you to keep on going the way you are, and if I could take my own advice, I would. But in the same breath, I can't really say "OMG come clean right now!" or "Quit escorting" as I don't really feel that will solve your problem.
I am sorry you feel this way, I feel it too.
Good luck though, and luckily, it's only temporary for both of us. Maybe when we're on the other side of it, we can just file it away in our memories as one of the "dark periods" that we all go through.