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For more on marking an answer as the "Best Answer", please visit our FAQ.Cheating on you by mail, with people that he's never met, is a pretty mild sort of cheating; and he's acted rather unusually and bravely in taking it back and telling them he really loves you. He could very well be feeling mixed up about his mother's illness.
That doesn't mean it's your duty to provide 'security and support', whatever that means... in fact, you probably need to sit down together and work out what it does mean. What does he need from you? Are you able, and willing, to provide it? To have a close relative very sick means you're in an artificial situation at the moment, and being long-distance is the same; but you should try to work together to smooth your path in the longer term.