Resolving the mess I'm in...

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I am in a terrible mess, and don't know how to straighten things out. It's very complicated, but I'll be as brief as possible in laying the background. I have been married for 28 years. Over the last few years, my wife has lost interest in sex and intimacy. I am 53, she is 48. Although we talked about this some, it didn't get better.
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About 7 months ago, I started an affair with another woman. At first, we agreed that the relationship would be to furnish each other with what we were both not getting at home. The lady I'm having the affair with was also married, and in somewhat of an abusive relationship. As the affair continued, we began developing strong feelings for each other.
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A month or so ago, we both decided that it was time to leave our respective situations, and be together. We got an apartment together in a nearby city, and moved in about a week and a half ago. I purchased basic furnishings, as I brought virtually nothing with me accept clothing and personal items, and she brought some items. The problem is, that I am having second thoughts about all of this, and my conscience is tugging at me to go back home.
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I made some promises to this lady that I would remain with her, and stand by her, which was a major factor in her decision to go ahead and leave her husband. She probably cannot afford to sustain herself financially by herself. I had a bad emotional day about a week back, and told her that I wasn't sure that I could do this, and I thought that she was going to have an emotional breakdown herself. This lady loves me immensely, there is no doubt about that. I love her too, but I don't know that it is as strong as her love for me. When I told her what I said above, she immediately reminded me of the promises I made to her, that she can't go back home for fear of being beaten, and can't afford to fully support herself. I backed off at that moment, and told myself that I would give this relationship a chance.
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Intimately, and sexually, things are great. I just can't get past the guilt, and the force that seems to be pulling me back towards my wife. Her mother had warned her about our relationship, and that is another factor, if we split up. Her mother is very domineering, and they have somewhat of a strained relationship.
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The lady I'm in the relationship with has kept copies of all of our e-mails, knows where my house is, knows where I attend church, where I work, and just about everything about me and my wife. I also fear exploitation through retaliation, as she would be terribly hurt if I go back to my wife. Do you have any useful advice for me, beyond "good luck"? Please hurry your response...time is of the essence.
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Live by yourself for a while until you know for sure where you belong.